tests: don't >-redirect without eval

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: John Kennedy <john.kennedy@delphix.com>
Reviewed-by: Ryan Moeller <ryan@iXsystems.com>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #13259

51 files changed, 190 insertions, 265 deletions

diff --git a/tests/zfs-tests/include/libtest.shlib b/tests/zfs-tests/include/libtest.shlib
index 828b842a655f..a78c10ce2ee6 100644
--- a/tests/zfs-tests/include/libtest.shlib
+++ b/tests/zfs-tests/include/libtest.shlib
@@ -657,7 +657,7 @@ function default_container_cleanup
 	destroy_dataset "$TESTPOOL/$TESTCTR" "-Rf"
 
 	[[ -e $TESTDIR1 ]] && \
-	    log_must rm -rf $TESTDIR1 > /dev/null 2>&1
+	    log_must rm -rf $TESTDIR1
 
 	default_cleanup
 }
@@ -3680,15 +3680,17 @@ function is_swap_inuse
 		return 1
 	fi
 
-	if is_linux; then
-		swapon -s | grep -w $(readlink -f $device) > /dev/null 2>&1
-	elif is_freebsd; then
-		swapctl -l | grep -w $device
-	else
-		swap -l | grep -w $device > /dev/null 2>&1
-	fi
-
-	return $?
+	case "$(uname)" in
+	Linux)
+		swapon -s | grep -wq $(readlink -f $device)
+		;;
+	FreeBSD)
+		swapctl -l | grep -wq $device
+		;;
+	*)
+		swap -l | grep -wq $device
+		;;
+	esac
 }
 
 #
@@ -3698,14 +3700,18 @@ function swap_setup
 {
 	typeset swapdev=$1
 
-	if is_linux; then
+	case "$(uname)" in
+	Linux)
 		log_must eval "mkswap $swapdev > /dev/null 2>&1"
 		log_must swapon $swapdev
-	elif is_freebsd; then
+		;;
+	FreeBSD)
 		log_must swapctl -a $swapdev
-	else
-	        log_must swap -a $swapdev
-	fi
+		;;
+	*)
+    log_must swap -a $swapdev
+		;;
+	esac
 
 	return 0
 }
diff --git a/tests/zfs-tests/tests/functional/cli_root/zdb/zdb_recover_2.ksh b/tests/zfs-tests/tests/functional/cli_root/zdb/zdb_recover_2.ksh
index 6470327a1765..d4529ff01105 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zdb/zdb_recover_2.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zdb/zdb_recover_2.ksh
@@ -48,7 +48,7 @@ verify_disk_count "$DISKS" 2
 
 default_mirror_setup_noexit $DISKS
 file_write -o create -w -f $init_data -b $blksize -c $write_count
-log_must echo "zfs" >> $init_data
+echo "zfs" >> $init_data
 sync_pool $TESTPOOL
 
 output=$(zdb -r $TESTPOOL/$TESTFS file1 $tmpfile)
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_mount/zfs_multi_mount.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_mount/zfs_multi_mount.ksh
index bd86eaa16bb4..c4b4f0773137 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zfs_mount/zfs_multi_mount.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_mount/zfs_multi_mount.ksh
@@ -56,7 +56,7 @@ log_must zfs create $TESTDS
 MNTPFS="$(get_prop mountpoint $TESTDS)"
 FILENAME="$MNTPFS/file"
 log_must mkfile 128k $FILENAME
-log_must exec 9<> $FILENAME # open file
+log_must eval "exec 9<> $FILENAME" # open file
 
 # 3. Lazy umount
 if is_freebsd; then
@@ -74,7 +74,7 @@ log_must zfs mount $TESTDS
 if [ ! -f $FILENAME ]; then
 	log_fail "Lazy remount failed"
 fi
-log_must exec 9>&- # close fd
+log_must eval "exec 9>&-" # close fd
 
 # 5. Verify multiple mounts of the same dataset are possible
 MNTPFS2="$MNTPFS-second"
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_receive/zfs_receive_010_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_receive/zfs_receive_010_pos.ksh
index 47e23e6ebca7..c91172ee048e 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zfs_receive/zfs_receive_010_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_receive/zfs_receive_010_pos.ksh
@@ -134,8 +134,7 @@ dd if=/dev/urandom of=$mntpnt/f18 bs=128k count=64
 touch $mntpnt2/f18
 
 # Remove objects that are intended to be missing.
-rm $mntpnt/h17
-rm $mntpnt2/h*
+rm $mntpnt/h17 $mntpnt2/h*
 
 # Add empty objects to $fs to exercise dmu_traverse code
 for i in {1..100}; do
@@ -145,15 +144,15 @@ done
 log_must zfs snapshot $fs@s1
 log_must zfs snapshot $fs2@s1
 
-log_must zfs send $fs@s1 > $TESTDIR/zr010p
-log_must zfs send $fs2@s1 > $TESTDIR/zr010p2
+log_must eval "zfs send $fs@s1 > $TESTDIR/zr010p"
+log_must eval "zfs send $fs2@s1 > $TESTDIR/zr010p2"
 
 
 #
 # Test that, when we receive a full send as a clone of itself,
 # nop-write saves us all the space used by data blocks.
 #
-cat $TESTDIR/zr010p | log_must zfs receive -o origin=$fs@s1 $rfs
+log_must eval "zfs receive -o origin=$fs@s1 $rfs < $TESTDIR/zr010p"
 size=$(get_prop used $rfs)
 size2=$(get_prop used $fs)
 if [[ $size -ge $(($size2 / 10)) ]] then
@@ -163,13 +162,13 @@ fi
 log_must zfs destroy -fr $rfs
 
 # Correctness testing: receive each full send as a clone of the other fiesystem.
-cat $TESTDIR/zr010p | log_must zfs receive -o origin=$fs2@s1 $rfs
+log_must eval "zfs receive -o origin=$fs2@s1 $rfs < $TESTDIR/zr010p"
 mntpnt_old=$(get_prop mountpoint $fs)
 mntpnt_new=$(get_prop mountpoint $rfs)
 log_must directory_diff $mntpnt_old $mntpnt_new
 log_must zfs destroy -r $rfs
 
-cat $TESTDIR/zr010p2 | log_must zfs receive -o origin=$fs@s1 $rfs
+log_must eval "zfs receive -o origin=$fs@s1 $rfs < $TESTDIR/zr010p2"
 mntpnt_old=$(get_prop mountpoint $fs2)
 mntpnt_new=$(get_prop mountpoint $rfs)
 log_must directory_diff $mntpnt_old $mntpnt_new
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_receive/zfs_receive_new_props.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_receive/zfs_receive_new_props.ksh
index 54f13355f5e8..ae63f5c6ac1d 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zfs_receive/zfs_receive_new_props.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_receive/zfs_receive_new_props.ksh
@@ -70,8 +70,8 @@ log_must zpool set feature@filesystem_limits=enabled "$rpoolname"
 log_must zfs create -o filesystem_limit=100 "$sendfs"
 log_must zfs snapshot "$sendfs@a"
 
-log_must zfs send -R "$sendfs@a" >"$streamfile"
-log_must eval "zfs recv -svuF $recvfs <$streamfile"
+log_must eval "zfs send -R \"$sendfs@a\" >\"$streamfile\""
+log_must eval "zfs recv -svuF \"$recvfs\" <\"$streamfile\""
 
 log_pass "ZFS can handle receiving streams with filesystem limits on \
 	pools where the feature was recently enabled"
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_007_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_007_pos.ksh
index 306fabc8cef4..85d076310588 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_007_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_send/zfs_send_007_pos.ksh
@@ -57,7 +57,7 @@ test_pool ()
 	POOL=$1
 	log_must zfs create -o recordsize=512 $POOL/fs
 	mntpnt=$(get_prop mountpoint "$POOL/fs")
-	log_must dd if=/dev/urandom of=${mntpnt}/file bs=512 count=1 2>/dev/null
+	log_must eval "dd if=/dev/urandom of=${mntpnt}/file bs=512 count=1 2>/dev/null"
 	object=$(ls -i $mntpnt | awk '{print $1}')
 	log_must zfs snapshot $POOL/fs@a
 	while true; do
diff --git a/tests/zfs-tests/tests/functional/cli_root/zfs_share/zfs_share_013_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zfs_share/zfs_share_013_pos.ksh
index 150eddac0ebb..e9766de49285 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zfs_share/zfs_share_013_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zfs_share/zfs_share_013_pos.ksh
@@ -46,35 +46,35 @@ cleanup
 
 log_must zfs set sharenfs="rw=[::1]" $TESTPOOL/$TESTFS
 output=$(showshares_nfs 2>&1)
-log_must grep "::1(" <<< "$output" > /dev/null
+log_must grep -q "::1(" <<< "$output"
 
 log_must zfs set sharenfs="rw=[2::3]" $TESTPOOL/$TESTFS
 output=$(showshares_nfs 2>&1)
-log_must grep "2::3(" <<< "$output" > /dev/null
+log_must grep -q "2::3(" <<< "$output"
 
 log_must zfs set sharenfs="rw=[::1]:[2::3]" $TESTPOOL/$TESTFS
 output=$(showshares_nfs 2>&1)
-log_must grep "::1(" <<< "$output" > /dev/null
-log_must grep "2::3(" <<< "$output" > /dev/null
+log_must grep -q "::1(" <<< "$output"
+log_must grep -q "2::3(" <<< "$output"
 
 log_must zfs set sharenfs="rw=[::1]/64" $TESTPOOL/$TESTFS
 output=$(showshares_nfs 2>&1)
-log_must grep "::1/64(" <<< "$output" > /dev/null
+log_must grep -q "::1/64(" <<< "$output"
 
 log_must zfs set sharenfs="rw=[2::3]/128" $TESTPOOL/$TESTFS
 output=$(showshares_nfs 2>&1)
-log_must grep "2::3/128(" <<< "$output" > /dev/null
+log_must grep -q "2::3/128(" <<< "$output"
 
 log_must zfs set sharenfs="rw=[::1]/32:[2::3]/128" $TESTPOOL/$TESTFS
 output=$(showshares_nfs 2>&1)
-log_must grep "::1/32(" <<< "$output" > /dev/null
-log_must grep "2::3/128(" <<< "$output" > /dev/null
+log_must grep -q "::1/32(" <<< "$output"
+log_must grep -q "2::3/128(" <<< "$output"
 
 log_must zfs set sharenfs="rw=[::1]:[2::3]/64:[2a01:1234:1234:1234:aa34:234:1234:1234]:1.2.3.4/24" $TESTPOOL/$TESTFS
 output=$(showshares_nfs 2>&1)
-log_must grep "::1(" <<< "$output" > /dev/null
-log_must grep "2::3/64(" <<< "$output" > /dev/null
-log_must grep "2a01:1234:1234:1234:aa34:234:1234:1234(" <<< "$output" > /dev/null
-log_must grep "1\\.2\\.3\\.4/24(" <<< "$output" > /dev/null
+log_must grep -q "::1(" <<< "$output"
+log_must grep -q "2::3/64(" <<< "$output"
+log_must grep -q "2a01:1234:1234:1234:aa34:234:1234:1234(" <<< "$output"
+log_must grep -q "1\\.2\\.3\\.4/24(" <<< "$output"
 
 log_pass "NFS share ip address propagated correctly."
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_expand/zpool_expand_003_neg.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_expand/zpool_expand_003_neg.ksh
index b3c71b666a59..2681e69f4e72 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_expand/zpool_expand_003_neg.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_expand/zpool_expand_003_neg.ksh
@@ -39,7 +39,6 @@
 # Once set zpool autoexpand=off, zpool can *NOT* autoexpand by
 # Dynamic VDEV Expansion
 #
-#
 # STRATEGY:
 # 1) Create three vdevs (loopback, scsi_debug, and file)
 # 2) Create pool by using the different devices and set autoexpand=off
@@ -73,7 +72,7 @@ log_onexit cleanup
 
 log_assert "zpool can not expand if set autoexpand=off after vdev expansion"
 
-for type in " " mirror raidz draid; do
+for type in "" mirror raidz draid; do
 	log_note "Setting up loopback, scsi_debug, and file vdevs"
 	log_must truncate -s $org_size $FILE_LO
 	DEV1=$(losetup -f)
@@ -89,11 +88,7 @@ for type in " " mirror raidz draid; do
 	# The -f is required since we're mixing disk and file vdevs.
 	log_must zpool create -f $TESTPOOL1 $type $DEV1 $DEV2 $DEV3
 
-	typeset autoexp=$(get_pool_prop autoexpand $TESTPOOL1)
-	if [[ $autoexp != "off" ]]; then
-		log_fail "zpool $TESTPOOL1 autoexpand should be off but is " \
-		    "$autoexp"
-	fi
+	log_must [ "$(get_pool_prop autoexpand $TESTPOOL1)" = "off" ]
 
 	typeset prev_size=$(get_pool_prop size $TESTPOOL1)
 
@@ -107,8 +102,8 @@ for type in " " mirror raidz draid; do
 	log_must losetup -c $DEV1
 	sleep 3
 
-	echo "2" > /sys/bus/pseudo/drivers/scsi_debug/virtual_gb
-	echo "1" > /sys/class/block/$DEV2/device/rescan
+	log_must eval "echo 2 > /sys/bus/pseudo/drivers/scsi_debug/virtual_gb"
+	log_must eval "echo 1 > /sys/class/block/$DEV2/device/rescan"
 	block_device_wait
 	sleep 3
 
@@ -119,18 +114,10 @@ for type in " " mirror raidz draid; do
 
 	# check for zpool history for the pool size expansion
 	zpool history -il $TESTPOOL1 | grep "pool '$TESTPOOL1' size:" | \
-	    grep "vdev online" >/dev/null 2>&1
-
-	if [[ $? -eq 0 ]]; then
-		log_fail "pool $TESTPOOL1 is not autoexpand after vdev " \
-		    "expansion"
-	fi
-
-	typeset expand_size=$(get_pool_prop size $TESTPOOL1)
+	    grep "vdev online" &&
+	    log_fail "pool $TESTPOOL1 is not autoexpand after vdev expansion"
 
-	if [[ "$prev_size" != "$expand_size" ]]; then
-		log_fail "pool $TESTPOOL1 size changed after vdev expansion"
-	fi
+	log_must [ "$(get_pool_prop size $TESTPOOL1)" = "$prev_size" ]
 
 	cleanup
 done
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import.kshlib b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import.kshlib
index 8bbd668a9317..5503d30b5512 100644
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import.kshlib
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import.kshlib
@@ -22,7 +22,7 @@
 function cleanup
 {
 	# clear any remaining zinjections
-	log_must zinject -c all > /dev/null
+	log_must eval "zinject -c all > /dev/null"
 
 	destroy_pool $TESTPOOL1
 
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_errata3.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_errata3.ksh
index 40b6ca1c1897..c5e578d79edb 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_errata3.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_import/zpool_import_errata3.ksh
@@ -44,17 +44,15 @@ POOL_FILE=cryptv0.dat
 function uncompress_pool
 {
 	log_note "Creating pool from $POOL_FILE"
-	log_must bzcat \
+	log_must eval bzcat \
 	    $STF_SUITE/tests/functional/cli_root/zpool_import/blockfiles/$POOL_FILE.bz2 \
-	    > /$TESTPOOL/$POOL_FILE
-	return 0
+	    "> /$TESTPOOL/$POOL_FILE"
 }
 
 function cleanup
 {
 	poolexists $POOL_NAME && log_must zpool destroy $POOL_NAME
-	[[ -e /$TESTPOOL/$POOL_FILE ]] && rm /$TESTPOOL/$POOL_FILE
-	return 0
+	log_must rm -f /$TESTPOOL/$POOL_FILE
 }
 log_onexit cleanup
 
diff --git a/tests/zfs-tests/tests/functional/cli_root/zpool_upgrade/zpool_upgrade_008_pos.ksh b/tests/zfs-tests/tests/functional/cli_root/zpool_upgrade/zpool_upgrade_008_pos.ksh
index d930919652bf..71d59b93a4ca 100755
--- a/tests/zfs-tests/tests/functional/cli_root/zpool_upgrade/zpool_upgrade_008_pos.ksh
+++ b/tests/zfs-tests/tests/functional/cli_root/zpool_upgrade/zpool_upgrade_008_pos.ksh
@@ -71,7 +71,7 @@ for ver_old in $VERSIONS; do
 	typeset -i ver_new=$(random_int_between $ver_old $MAX_VER)
 
 	create_old_pool $ver_old
-	log_must zpool upgrade -V $ver_new $pool_name > /dev/null
+	log_must eval 'zpool upgrade -V $ver_new $pool_name > /dev/null'
 	check_poolversion $pool_name $ver_new
 	destroy_upgraded_pool $ver_old
 done
diff --git a/tests/zfs-tests/tests/functional/features/large_dnode/large_dnode_005_pos.ksh b/tests/zfs-tests/tests/functional/features/large_dnode/large_dnode_005_pos.ksh
index 03e2db4b8082..1d167e3ae59f 100755
--- a/tests/zfs-tests/tests/functional/features/large_dnode/large_dnode_005_pos.ksh
+++ b/tests/zfs-tests/tests/functional/features/large_dnode/large_dnode_005_pos.ksh
@@ -54,11 +54,11 @@ log_assert "zfs send stream with large dnodes accepted by new pool"
 log_must zfs create -o dnodesize=1k $TEST_SEND_FS
 log_must touch /$TEST_SEND_FS/$TEST_FILE
 log_must zfs snap $TEST_SNAP
-log_must zfs send $TEST_SNAP > $TEST_STREAM
+log_must eval "zfs send $TEST_SNAP > $TEST_STREAM"
 log_must rm -f /$TEST_SEND_FS/$TEST_FILE
 log_must touch /$TEST_SEND_FS/$TEST_FILEINCR
 log_must zfs snap $TEST_SNAPINCR
-log_must zfs send -i $TEST_SNAP $TEST_SNAPINCR > $TEST_STREAMINCR
+log_must eval "zfs send -i $TEST_SNAP $TEST_SNAPINCR > $TEST_STREAMINCR"
 
 log_must eval "zfs recv $TEST_RECV_FS < $TEST_STREAM"
 inode=$(ls -li /$TEST_RECV_FS/$TEST_FILE | awk '{print $1}')
diff --git a/tests/zfs-tests/tests/functional/features/large_dnode/large_dnode_009_pos.ksh b/tests/zfs-tests/tests/functional/features/large_dnode/large_dnode_009_pos.ksh
index 1e42202069eb..0b61e1df2226 100755
--- a/tests/zfs-tests/tests/functional/features/large_dnode/large_dnode_009_pos.ksh
+++ b/tests/zfs-tests/tests/functional/features/large_dnode/large_dnode_009_pos.ksh
@@ -66,6 +66,6 @@ log_must wait
 
 log_must_busy zpool export $TESTPOOL
 log_must zpool import $TESTPOOL
-log_must ls -lR "/$TEST_FS/" >/dev/null 2>&1
+log_must eval "ls -lR /$TEST_FS/ >/dev/null 2>&1"
 log_must zdb -d $TESTPOOL
 log_pass
diff --git a/tests/zfs-tests/tests/functional/history/history_005_neg.ksh b/tests/zfs-tests/tests/functional/history/history_005_neg.ksh
index 297a701cc567..5038af4a7c79 100755
--- a/tests/zfs-tests/tests/functional/history/history_005_neg.ksh
+++ b/tests/zfs-tests/tests/functional/history/history_005_neg.ksh
@@ -54,10 +54,10 @@ log_assert "Verify 'zpool get|history|list|status|iostat' will not be logged."
 # Save initial TESTPOOL history
 log_must eval "zpool history $TESTPOOL >$OLD_HISTORY"
 
-log_must zpool get all $TESTPOOL >/dev/null
-log_must zpool list $TESTPOOL >/dev/null
-log_must zpool status $TESTPOOL >/dev/null
-log_must zpool iostat $TESTPOOL >/dev/null
+log_must eval "zpool get all $TESTPOOL >/dev/null"
+log_must eval "zpool list $TESTPOOL >/dev/null"
+log_must eval "zpool status $TESTPOOL >/dev/null"
+log_must eval "zpool iostat $TESTPOOL >/dev/null"
 
 log_must eval "zpool history $TESTPOOL >$NEW_HISTORY"
 log_must diff $OLD_HISTORY $NEW_HISTORY
diff --git a/tests/zfs-tests/tests/functional/history/history_006_neg.ksh b/tests/zfs-tests/tests/functional/history/history_006_neg.ksh
index 19b7114faf5b..a1e76e68b802 100755
--- a/tests/zfs-tests/tests/functional/history/history_006_neg.ksh
+++ b/tests/zfs-tests/tests/functional/history/history_006_neg.ksh
@@ -67,15 +67,15 @@ log_must zfs snapshot $snap2
 # Save initial TESTPOOL history
 log_must eval "zpool history $TESTPOOL > $OLD_HISTORY"
 
-log_must zfs list $fs > /dev/null
-log_must zfs get mountpoint $fs > /dev/null
+log_must eval "zfs list $fs > /dev/null"
+log_must eval "zfs get mountpoint $fs > /dev/null"
 log_must zfs unmount $fs
 log_must zfs mount $fs
 if ! is_linux; then
 	log_must zfs share $fs
 	log_must zfs unshare $fs
 fi
-log_must zfs send -i $snap1 $snap2 > /dev/null
+log_must eval "zfs send -i $snap1 $snap2 > /dev/null"
 log_must zfs holds $snap1
 
 log_must eval "zpool history $TESTPOOL > $NEW_HISTORY"
diff --git a/tests/zfs-tests/tests/functional/inuse/inuse_001_pos.ksh b/tests/zfs-tests/tests/functional/inuse/inuse_001_pos.ksh
index f824661c0067..25a807025c87 100755
--- a/tests/zfs-tests/tests/functional/inuse/inuse_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/inuse/inuse_001_pos.ksh
@@ -49,7 +49,7 @@ function cleanup
 	# Remove dump device.
 	#
 	if [[ -n $PREVDUMPDEV ]]; then
-		log_must dumpadm -u -d $PREVDUMPDEV > /dev/null
+		log_must eval "dumpadm -u -d $PREVDUMPDEV > /dev/null"
 	fi
 
 	destroy_pool $TESTPOOL
@@ -61,16 +61,16 @@ log_onexit cleanup
 
 typeset dumpdev=""
 
-PREVDUMPDEV=`dumpadm | grep "Dump device" | awk '{print $3}'`
+PREVDUMPDEV=`dumpadm | awk '/Dump device/ {print $3}'`
 
 log_note "Zero $FS_DISK0"
 log_must cleanup_devices $FS_DISK0
 
 log_note "Configuring $rawdisk0 as dump device"
-log_must dumpadm -d $rawdisk0 > /dev/null
+log_must eval "dumpadm -d $rawdisk0 > /dev/null"
 
 log_note "Confirm that dump device has been setup"
-dumpdev=`dumpadm | grep "Dump device" | awk '{print $3}'`
+dumpdev=`dumpadm | awk '/Dump device/ {print $3}'`
 [[ -z "$dumpdev" ]] && log_untested "No dump device has been configured"
 
 [[ "$dumpdev" != "$rawdisk0" ]] && \
diff --git a/tests/zfs-tests/tests/functional/inuse/inuse_003_pos.ksh b/tests/zfs-tests/tests/functional/inuse/inuse_003_pos.ksh
index 07d6ac17557c..24918e217428 100755
--- a/tests/zfs-tests/tests/functional/inuse/inuse_003_pos.ksh
+++ b/tests/zfs-tests/tests/functional/inuse/inuse_003_pos.ksh
@@ -58,25 +58,21 @@ function cleanup
 
 	log_note "Kill off ufsdump process if still running"
 	kill -0 $PIDUFSDUMP > /dev/null 2>&1 && \
-	    log_must kill -9 $PIDUFSDUMP  > /dev/null 2>&1
+	    log_must eval "kill -9 $PIDUFSDUMP"
 	#
 	# Note: It would appear that ufsdump spawns a number of processes
 	# which are not killed when the $PIDUFSDUMP is whacked.  So best bet
 	# is to find the rest of the them and deal with them individually.
 	#
-	for all in `pgrep ufsdump`
-	do
-		kill -9 $all > /dev/null 2>&1
-	done
+	kill -9 `pgrep ufsdump` > /dev/null 2>&1
 
 	log_note "Kill off ufsrestore process if still running"
 	kill -0 $PIDUFSRESTORE > /dev/null 2>&1 && \
-	    log_must kill -9 $PIDUFSRESTORE  > /dev/null 2>&1
+	    log_must eval "kill -9 $PIDUFSRESTORE"
 
 	ismounted $UFSMP ufs && log_must umount $UFSMP
 
-	rm -rf $UFSMP
-	rm -rf $TESTDIR
+	rm -rf $UFSMP $TESTDIR
 
 	#
 	# Tidy up the disks we used.
diff --git a/tests/zfs-tests/tests/functional/mmp/mmp.kshlib b/tests/zfs-tests/tests/functional/mmp/mmp.kshlib
index 661cbf3a52e7..5fb22bd85c69 100644
--- a/tests/zfs-tests/tests/functional/mmp/mmp.kshlib
+++ b/tests/zfs-tests/tests/functional/mmp/mmp.kshlib
@@ -180,13 +180,11 @@ function seconds_mmp_waits_for_activity
 	typeset mmp_write
 	typeset mmp_delay
 
-	log_must zdb -e -p $devpath $pool >$tmpfile 2>/dev/null
+	log_must eval "zdb -e -p $devpath $pool >$tmpfile 2>/dev/null"
 	mmp_fail=$(awk '/mmp_fail/ {print $NF}' $tmpfile)
 	mmp_write=$(awk '/mmp_write/ {print $NF}' $tmpfile)
 	mmp_delay=$(awk '/mmp_delay/ {print $NF}' $tmpfile)
-	if [ -f $tmpfile ]; then
-		rm $tmpfile
-	fi
+	rm $tmpfile
 
 	# In order of preference:
 	if [ -n $mmp_fail -a -n $mmp_write ]; then
diff --git a/tests/zfs-tests/tests/functional/mmp/mmp_on_off.ksh b/tests/zfs-tests/tests/functional/mmp/mmp_on_off.ksh
index 29d771de8f8b..513b7d31f9cd 100755
--- a/tests/zfs-tests/tests/functional/mmp/mmp_on_off.ksh
+++ b/tests/zfs-tests/tests/functional/mmp/mmp_on_off.ksh
@@ -60,9 +60,9 @@ log_must mmp_set_hostid $HOSTID1
 default_setup_noexit $DISK
 log_must zpool set multihost=off $TESTPOOL
 
-log_must zdb -u $TESTPOOL > $PREV_UBER
+log_must eval "zdb -u $TESTPOOL > $PREV_UBER"
 log_must sleep 5
-log_must zdb -u $TESTPOOL > $CURR_UBER
+log_must eval "zdb -u $TESTPOOL > $CURR_UBER"
 
 if ! diff "$CURR_UBER" "$PREV_UBER"; then
 	log_fail "mmp thread has updated an uberblock"
@@ -70,7 +70,7 @@ fi
 
 log_must zpool set multihost=on $TESTPOOL
 log_must sleep 5
-log_must zdb -u $TESTPOOL > $CURR_UBER
+log_must eval "zdb -u $TESTPOOL > $CURR_UBER"
 
 if diff "$CURR_UBER" "$PREV_UBER"; then
 	log_fail "mmp failed to update uberblocks"
diff --git a/tests/zfs-tests/tests/functional/mmp/mmp_on_thread.ksh b/tests/zfs-tests/tests/functional/mmp/mmp_on_thread.ksh
index 01cca61c3c3e..cd82fa47e23f 100755
--- a/tests/zfs-tests/tests/functional/mmp/mmp_on_thread.ksh
+++ b/tests/zfs-tests/tests/functional/mmp/mmp_on_thread.ksh
@@ -53,9 +53,9 @@ log_must mmp_set_hostid $HOSTID1
 default_setup_noexit $DISK
 log_must zpool set multihost=on $TESTPOOL
 
-log_must zdb -u $TESTPOOL > $PREV_UBER
+log_must eval "zdb -u $TESTPOOL > $PREV_UBER"
 log_must sleep 5
-log_must zdb -u $TESTPOOL > $CURR_UBER
+log_must eval "zdb -u $TESTPOOL > $CURR_UBER"
 
 if diff -u "$CURR_UBER" "$PREV_UBER"; then
 	log_fail "mmp failed to update uberblocks"
diff --git a/tests/zfs-tests/tests/functional/no_space/enospc_002_pos.ksh b/tests/zfs-tests/tests/functional/no_space/enospc_002_pos.ksh
index 2fb3fb46c44c..0aecbea7eb27 100755
--- a/tests/zfs-tests/tests/functional/no_space/enospc_002_pos.ksh
+++ b/tests/zfs-tests/tests/functional/no_space/enospc_002_pos.ksh
@@ -62,8 +62,8 @@ done
 log_mustnot_expect space zfs create $TESTPOOL/$TESTFS/subfs
 log_mustnot_expect space zfs clone $TESTPOOL/$TESTFS@snap $TESTPOOL/clone
 
-log_must zfs send $TESTPOOL/$TESTFS@snap > $TEST_BASE_DIR/stream.$$
-log_mustnot_expect space zfs receive $TESTPOOL/$TESTFS/recvd < $TEST_BASE_DIR/stream.$$
+log_must eval "zfs send $TESTPOOL/$TESTFS@snap > $TEST_BASE_DIR/stream.$$"
+log_mustnot_expect space eval "zfs receive $TESTPOOL/$TESTFS/recvd < $TEST_BASE_DIR/stream.$$"
 log_must rm $TEST_BASE_DIR/stream.$$
 
 log_must zfs rename $TESTPOOL/$TESTFS@snap $TESTPOOL/$TESTFS@snap_newname
diff --git a/tests/zfs-tests/tests/functional/procfs/procfs_list_stale_read.ksh b/tests/zfs-tests/tests/functional/procfs/procfs_list_stale_read.ksh
index b3958b345d2a..dcc71788682d 100755
--- a/tests/zfs-tests/tests/functional/procfs/procfs_list_stale_read.ksh
+++ b/tests/zfs-tests/tests/functional/procfs/procfs_list_stale_read.ksh
@@ -74,9 +74,9 @@ function do_test
 	# finish reading.
 	#
 	{
-		log_must dd bs=512 count=4 >/dev/null
+		log_must eval "dd bs=512 count=4 >/dev/null"
 		log_must eval "$cmd"
-		cat 2>&1 >/dev/null | log_must grep "Input/output error"
+		log_must eval 'cat 2>&1 >/dev/null | grep "Input/output error"'
 	} <$TXG_HIST
 }
 
diff --git a/tests/zfs-tests/tests/functional/redundancy/redundancy_draid.ksh b/tests/zfs-tests/tests/functional/redundancy/redundancy_draid.ksh
index b2721707cb75..285318853a9e 100755
--- a/tests/zfs-tests/tests/functional/redundancy/redundancy_draid.ksh
+++ b/tests/zfs-tests/tests/functional/redundancy/redundancy_draid.ksh
@@ -77,7 +77,7 @@ function test_selfheal # <pool> <parity> <dir>
 	log_must zpool import -o cachefile=none -d $dir $pool
 
 	typeset mntpnt=$(get_prop mountpoint $pool/fs)
-	log_must find $mntpnt -type f -exec cksum {} + >> /dev/null 2>&1
+	log_must eval "find $mntpnt -type f -exec cksum {} + >> /dev/null 2>&1"
 	log_must check_pool_status $pool "errors" "No known data errors"
 
 	#
@@ -100,7 +100,7 @@ function test_selfheal # <pool> <parity> <dir>
 	log_must zpool import -o cachefile=none -d $dir $pool
 
 	typeset mntpnt=$(get_prop mountpoint $pool/fs)
-	log_must find $mntpnt -type f -exec cksum {} + >> /dev/null 2>&1
+	log_must eval "find $mntpnt -type f -exec cksum {} + >> /dev/null 2>&1"
 	log_must check_pool_status $pool "errors" "No known data errors"
 
 	log_must zpool scrub -w $pool
diff --git a/tests/zfs-tests/tests/functional/redundancy/redundancy_raidz.ksh b/tests/zfs-tests/tests/functional/redundancy/redundancy_raidz.ksh
index 7351cfaae5ed..a3ea3e53cb75 100755
--- a/tests/zfs-tests/tests/functional/redundancy/redundancy_raidz.ksh
+++ b/tests/zfs-tests/tests/functional/redundancy/redundancy_raidz.ksh
@@ -77,7 +77,7 @@ function test_selfheal # <pool> <parity> <dir>
 	log_must zpool import -o cachefile=none -d $dir $pool
 
 	typeset mntpnt=$(get_prop mountpoint $pool/fs)
-	log_must find $mntpnt -type f -exec cksum {} + >> /dev/null 2>&1
+	log_must eval "find $mntpnt -type f -exec cksum {} + >> /dev/null 2>&1"
 	log_must check_pool_status $pool "errors" "No known data errors"
 
 	#
@@ -100,7 +100,7 @@ function test_selfheal # <pool> <parity> <dir>
 	log_must zpool import -o cachefile=none -d $dir $pool
 
 	typeset mntpnt=$(get_prop mountpoint $pool/fs)
-	log_must find $mntpnt -type f -exec cksum {} + >> /dev/null 2>&1
+	log_must eval "find $mntpnt -type f -exec cksum {} + >> /dev/null 2>&1"
 	log_must check_pool_status $pool "errors" "No known data errors"
 
 	log_must zpool scrub -w $pool
diff --git a/tests/zfs-tests/tests/functional/replacement/resilver_restart_001.ksh b/tests/zfs-tests/tests/functional/replacement/resilver_restart_001.ksh
index 269d31bf8905..937693a67c9e 100755
--- a/tests/zfs-tests/tests/functional/replacement/resilver_restart_001.ksh
+++ b/tests/zfs-tests/tests/functional/replacement/resilver_restart_001.ksh
@@ -162,7 +162,7 @@ do
 
 	# inject read io errors on vdev and verify resilver does not restart
 	log_must zinject -a -d ${VDEV_FILES[2]} -e io -T read -f 0.25 $TESTPOOL1
-	log_must cat ${DATAPATHS[1]} > /dev/null
+	log_must eval "cat ${DATAPATHS[1]} > /dev/null"
 	log_must zinject -c all
 
 	# there should still be 2 resilver starts w/o defer, 1 with defer
diff --git a/tests/zfs-tests/tests/functional/replacement/resilver_restart_002.ksh b/tests/zfs-tests/tests/functional/replacement/resilver_restart_002.ksh
index 4f2707693d13..67be04e1e0ed 100755
--- a/tests/zfs-tests/tests/functional/replacement/resilver_restart_002.ksh
+++ b/tests/zfs-tests/tests/functional/replacement/resilver_restart_002.ksh
@@ -57,7 +57,7 @@ log_must set_tunable32 SCAN_LEGACY 1
  # create the pool and a 32M file (32k blocks)
 log_must truncate -s $VDEV_FILE_SIZE ${VDEV_FILES[0]} $SPARE_VDEV_FILE
 log_must zpool create -f -O recordsize=1k $TESTPOOL1 ${VDEV_FILES[0]}
-log_must dd if=/dev/urandom of=/$TESTPOOL1/file bs=1M count=32 > /dev/null 2>&1
+log_must eval "dd if=/dev/urandom of=/$TESTPOOL1/file bs=1M count=32 2>/dev/null"
 
 # determine objset/object
 objset=$(zdb -d $TESTPOOL1/ | sed -ne 's/.*ID \([0-9]*\).*/\1/p')
diff --git a/tests/zfs-tests/tests/functional/rsend/rsend.kshlib b/tests/zfs-tests/tests/functional/rsend/rsend.kshlib
index 8d704ee36876..1df5c3542e7d 100644
--- a/tests/zfs-tests/tests/functional/rsend/rsend.kshlib
+++ b/tests/zfs-tests/tests/functional/rsend/rsend.kshlib
@@ -128,7 +128,7 @@ function cleanup_pool
 		#
 		# https://github.com/openzfs/zfs/issues/6143
 		#
-		log_must df >/dev/null
+		log_must eval "df >/dev/null"
 		log_must_busy zfs destroy -Rf $pool
 	else
 		typeset list=$(zfs list -H -r -t all -o name $pool)
@@ -153,8 +153,6 @@ function cleanup_pool
 	if [[ -d $mntpnt ]]; then
 		rm -rf $mntpnt/*
 	fi
-
-	return 0
 }
 
 function cleanup_pools
@@ -655,7 +653,7 @@ function resume_test
 
 	for ((i=0; i<2; i=i+1)); do
 		mess_send_file /$streamfs/$stream_num
-		log_mustnot zfs recv -suv $recvfs </$streamfs/$stream_num
+		log_mustnot eval "zfs recv -suv $recvfs </$streamfs/$stream_num"
 		stream_num=$((stream_num+1))
 
 		token=$(zfs get -Hp -o value receive_resume_token $recvfs)
@@ -665,10 +663,8 @@ function resume_test
 			log_must eval "zfs send -nvt $token > /dev/null"
 
 		log_must eval "zfs send -t $token  >/$streamfs/$stream_num"
-		[[ -f /$streamfs/$stream_num ]] || \
-		    log_fail "NO FILE /$streamfs/$stream_num"
 	done
-	log_must zfs recv -suv $recvfs </$streamfs/$stream_num
+	log_must eval "zfs recv -suv $recvfs </$streamfs/$stream_num"
 }
 
 function get_resume_token
@@ -679,11 +675,8 @@ function get_resume_token
 
 	log_must eval "$sendcmd > /$streamfs/1"
 	mess_send_file /$streamfs/1
-	log_mustnot zfs recv -suv $recvfs < /$streamfs/1 2>&1
-	token=$(zfs get -Hp -o value receive_resume_token $recvfs)
-	echo "$token" > /$streamfs/resume_token
-
-	return 0
+	log_mustnot eval "zfs recv -suv $recvfs < /$streamfs/1 2>&1"
+	get_prop receive_resume_token $recvfs > /$streamfs/resume_token
 }
 
 #
diff --git a/tests/zfs-tests/tests/functional/snapshot/clone_001_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/clone_001_pos.ksh
index 1c8a3b2a6c20..9a63bf23483e 100755
--- a/tests/zfs-tests/tests/functional/snapshot/clone_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/clone_001_pos.ksh
@@ -113,8 +113,7 @@ log_onexit cleanup_all
 
 setup_all
 
-[[ -n $TESTDIR ]] && \
-    log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+[ -n $TESTDIR ] && log_must rm -rf $TESTDIR/*
 
 typeset -i COUNT=10
 typeset -i i=0
diff --git a/tests/zfs-tests/tests/functional/snapshot/rollback_001_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/rollback_001_pos.ksh
index 97194f4fe4a0..34e72a70d7d4 100755
--- a/tests/zfs-tests/tests/functional/snapshot/rollback_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/rollback_001_pos.ksh
@@ -55,16 +55,14 @@ function cleanup
 	[[ $? -eq 0 ]] && \
 		log_must zfs destroy $SNAPFS
 
-	[[ -e $TESTDIR ]] && \
-		log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+	[ -e $TESTDIR ] && log_must rm -rf $TESTDIR/*
 }
 
 log_assert "Verify that a rollback to a previous snapshot succeeds."
 
 log_onexit cleanup
 
-[[ -n $TESTDIR ]] && \
-    log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+[ -n $TESTDIR ] && log_must rm -rf $TESTDIR/*
 
 typeset -i COUNT=10
 
diff --git a/tests/zfs-tests/tests/functional/snapshot/rollback_002_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/rollback_002_pos.ksh
index c424a69f0a7e..dc375e2224c2 100755
--- a/tests/zfs-tests/tests/functional/snapshot/rollback_002_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/rollback_002_pos.ksh
@@ -59,16 +59,14 @@ function cleanup
 	[[ $? -eq 0 ]] && \
 		log_must zfs destroy $SNAPFS
 
-	[[ -e $TESTDIR ]] && \
-		log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+	[ -e $TESTDIR ] && log_must rm -rf $TESTDIR/*
 }
 
 log_assert "Verify rollback is with respect to latest snapshot."
 
 log_onexit cleanup
 
-[[ -n $TESTDIR ]] && \
-    log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+[ -n $TESTDIR ] && log_must rm -rf $TESTDIR/*
 
 typeset -i COUNT=10
 
@@ -109,8 +107,7 @@ while [[ $i -le $COUNT ]]; do
         (( i = i + 1 ))
 done
 
-[[ -n $TESTDIR ]] && \
-    log_must rm -rf $TESTDIR/original_file* > /dev/null 2>&1
+[ -n $TESTDIR ] && log_must rm -f $TESTDIR/original_file*
 
 #
 # Now rollback to latest snapshot
diff --git a/tests/zfs-tests/tests/functional/snapshot/rollback_003_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/rollback_003_pos.ksh
index 766de990ecdb..e707640acd14 100755
--- a/tests/zfs-tests/tests/functional/snapshot/rollback_003_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/rollback_003_pos.ksh
@@ -100,7 +100,7 @@ log_must zfs snapshot $SNAPPOOL.1
 #
 # https://github.com/openzfs/zfs/issues/6143
 #
-log_must df >/dev/null
+log_must eval "df >/dev/null"
 
 export __ZFS_POOL_RESTRICT="$TESTPOOL"
 log_must zfs unmount -a
@@ -110,6 +110,6 @@ unset __ZFS_POOL_RESTRICT
 log_must touch /$TESTPOOL/$TESTFILE/$TESTFILE.1
 
 log_must zfs rollback $SNAPPOOL.1
-log_must df >/dev/null
+log_must eval "df >/dev/null"
 
 log_pass "Rollbacks succeed when nested file systems are present."
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_001_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_001_pos.ksh
index 6a55a902fb20..9a677b036ead 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_001_pos.ksh
@@ -54,7 +54,7 @@ function cleanup
 		log_must zfs destroy $SNAPFS
 	fi
 
-	log_must rm -rf $SNAPDIR $TESTDIR/* > /dev/null 2>&1
+	log_must rm -rf $SNAPDIR $TESTDIR/*
 }
 
 log_assert "Verify a file system snapshot is identical to original."
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_002_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_002_pos.ksh
index 42fbbd9a7a2b..a3ed1b548210 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_002_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_002_pos.ksh
@@ -51,26 +51,13 @@ verify_runnable "both"
 
 function cleanup
 {
-	if [[ -d $CWD ]]; then
-		cd $CWD || log_fail "Could not cd $CWD"
-	fi
-
-	snapexists $SNAPFS
-	if [[ $? -eq 0 ]]; then
-		log_must zfs destroy $SNAPFS
-	fi
-
-	if [[ -e $SNAPDIR ]]; then
-		log_must rm -rf $SNAPDIR > /dev/null 2>&1
-	fi
-
-	if [[ -e $TESTDIR ]]; then
-		log_must rm -rf $TESTDIR/* > /dev/null 2>&1
-	fi
-
-	if [[ -d "$SNAPSHOT_TARDIR" ]]; then
-		log_must rm -rf $SNAPSHOT_TARDIR > /dev/null 2>&1
-	fi
+	[ -d $CWD ] && log_must cd $CWD
+
+	snapexists $SNAPFS && log_must zfs destroy $SNAPFS
+
+	[ -e $SNAPDIR ] && log_must rm -rf $SNAPDIR
+	[ -e $TESTDIR ] && log_must rm -rf $TESTDIR/*
+	[ -d "$SNAPSHOT_TARDIR" ] && log_must rm -rf $SNAPSHOT_TARDIR
 }
 
 log_assert "Verify an archive of a file system is identical to " \
@@ -82,8 +69,7 @@ log_onexit cleanup
 typeset -i COUNT=21
 typeset OP=create
 
-[[ -n $TESTDIR ]] && \
-    rm -rf $TESTDIR/* > /dev/null 2>&1
+[ -n $TESTDIR ] && rm -rf $TESTDIR/*
 
 log_note "Create files in the zfs filesystem..."
 
@@ -96,33 +82,32 @@ done
 
 log_note "Create a tarball from $TESTDIR contents..."
 CWD=$PWD
-cd $TESTDIR || log_fail "Could not cd $TESTDIR"
+log_must cd $TESTDIR
 log_must tar cf $SNAPSHOT_TARDIR/original.tar .
-cd $CWD || log_fail "Could not cd $CWD"
+log_must cd $CWD
 
 log_note "Create a snapshot and mount it..."
 log_must zfs snapshot $SNAPFS
 
 log_note "Remove all of the original files..."
-log_must rm -f $TESTDIR/file* > /dev/null 2>&1
+log_must rm -f $TESTDIR/file*
 
 log_note "Create tarball of snapshot..."
 CWD=$PWD
-cd $SNAPDIR || log_fail "Could not cd $SNAPDIR"
+log_must cd $SNAPDIR
 log_must tar cf $SNAPSHOT_TARDIR/snapshot.tar .
-cd $CWD || log_fail "Could not cd $CWD"
+log_must cd $CWD
 
-log_must mkdir $TESTDIR/original
-log_must mkdir $TESTDIR/snapshot
+log_must mkdir $TESTDIR/original $TESTDIR/snapshot
 
 CWD=$PWD
-cd $TESTDIR/original || log_fail "Could not cd $TESTDIR/original"
+log_must cd $TESTDIR/original
 log_must tar xf $SNAPSHOT_TARDIR/original.tar
 
-cd $TESTDIR/snapshot || log_fail "Could not cd $TESTDIR/snapshot"
+log_must cd $TESTDIR/snapshot
 log_must tar xf $SNAPSHOT_TARDIR/snapshot.tar
 
-cd $CWD || log_fail "Could not cd $CWD"
+log_must cd $CWD
 
 log_must directory_diff $TESTDIR/original $TESTDIR/snapshot
 log_pass "Directory structures match."
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_003_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_003_pos.ksh
index 054b58cd5590..8cb7298a4836 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_003_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_003_pos.ksh
@@ -49,20 +49,17 @@ function cleanup
 {
 	typeset -i i=1
 	while [ $i -lt $COUNT ]; do
-		snapexists $SNAPFS.$i
-		if [[ $? -eq 0 ]]; then
-			log_must zfs destroy $SNAPFS.$i
-		fi
+		snapexists $SNAPFS.$i && log_must zfs destroy $SNAPFS.$i
 
-		if [[ -e $SNAPDIR.$i ]]; then
-			log_must rm -rf $SNAPDIR.$i > /dev/null 2>&1
+		if [ -e $SNAPDIR.$i ]; then
+			log_must rm -rf $SNAPDIR.$i
 		fi
 
 		(( i = i + 1 ))
 	done
 
-	if [[ -e $TESTDIR ]]; then
-		log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+	if [ -e $TESTDIR ]; then
+		log_must rm -rf $TESTDIR/*
 	fi
 }
 
@@ -70,8 +67,7 @@ log_assert "Verify many snapshots of a file system can be taken."
 
 log_onexit cleanup
 
-[[ -n $TESTDIR ]] && \
-    log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+[ -n $TESTDIR ] && log_must rm -rf $TESTDIR/*
 
 typeset -i COUNT=10
 
@@ -86,8 +82,7 @@ while [[ $i -lt $COUNT ]]; do
 done
 
 log_note "Remove all of the original files"
-[[ -n $TESTDIR ]] && \
-    log_must rm -rf $TESTDIR/file* > /dev/null 2>&1
+[ -n $TESTDIR ] && log_must rm -rf $TESTDIR/file*
 
 i=1
 while [[ $i -lt $COUNT ]]; do
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_004_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_004_pos.ksh
index 9d3b3de1adc0..44fc6ec9e988 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_004_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_004_pos.ksh
@@ -48,20 +48,16 @@ verify_runnable "both"
 
 function cleanup
 {
-	snapexists $SNAPFS
-	[[ $? -eq 0 ]] && \
-		log_must zfs destroy $SNAPFS
+	snapexists $SNAPFS && log_must zfs destroy $SNAPFS
 
-	[[ -e $TESTDIR ]] && \
-		log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+	[ -e $TESTDIR ] && log_must rm -rf $TESTDIR/*
 }
 
 log_assert "Verify that a snapshot of an empty file system remains empty."
 
 log_onexit cleanup
 
-[[ -n $TESTDIR ]] && \
-    log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+[ -n $TESTDIR ] && log_must rm -rf $TESTDIR/*
 
 log_must zfs snapshot $SNAPFS
 FILE_COUNT=`ls -Al $SNAPDIR | grep -v "total 0" | wc -l`
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_005_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_005_pos.ksh
index 9cff0decc698..a5667badf53a 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_005_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_005_pos.ksh
@@ -49,17 +49,14 @@ verify_runnable "both"
 
 function cleanup
 {
-	snapexists $SNAPCTR
-	if [[ $? -eq 0 ]]; then
-		log_must zfs destroy $SNAPCTR
-	fi
+	snapexists $SNAPCTR && log_must zfs destroy $SNAPCTR
 
-	if [[ -e $SNAPDIR1 ]]; then
-		log_must rm -rf $SNAPDIR1 > /dev/null 2>&1
+	if [ -e $SNAPDIR1 ]; then
+		log_must rm -rf $SNAPDIR1
 	fi
 
-	if [[ -e $TESTDIR ]]; then
-		log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+	if [ -e $TESTDIR ]; then
+		log_must rm -rf $TESTDIR/*
 	fi
 }
 
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_006_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_006_pos.ksh
index d2a304670981..2130ff8901cd 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_006_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_006_pos.ksh
@@ -51,24 +51,21 @@ verify_runnable "both"
 function cleanup
 {
 	if [[ -d $CWD ]]; then
-		cd $CWD || log_fail "Could not cd $CWD"
+		log_must cd $CWD
 	fi
 
-	snapexists $SNAPCTR
-	if [[ $? -eq 0 ]]; then
-		log_must zfs destroy $SNAPCTR
-	fi
+	snapexists $SNAPCTR && log_must zfs destroy $SNAPCTR
 
-	if [[ -e $SNAPDIR1 ]]; then
-		log_must rm -rf $SNAPDIR1 > /dev/null 2>&1
+	if [ -e $SNAPDIR1 ]; then
+		log_must rm -rf $SNAPDIR1
 	fi
 
-	if [[ -e $TESTDIR1 ]]; then
-		log_must rm -rf $TESTDIR1/* > /dev/null 2>&1
+	if [ -e $TESTDIR1 ]; then
+		log_must rm -rf $TESTDIR1/*
 	fi
 
-	if [[ -d "$SNAPSHOT_TARDIR" ]]; then
-		log_must rm -rf $SNAPSHOT_TARDIR > /dev/null 2>&1
+	if [ -d "$SNAPSHOT_TARDIR" ]; then
+		log_must rm -rf $SNAPSHOT_TARDIR
 	fi
 }
 
@@ -81,7 +78,7 @@ log_onexit cleanup
 typeset -i COUNT=21
 typeset OP=create
 
-[[ -n $TESTDIR1 ]] && rm -rf $TESTDIR1/* > /dev/null 2>&1
+[ -n $TESTDIR1 ] && rm -rf $TESTDIR1/*
 
 log_note "Create files in the zfs dataset ..."
 
@@ -94,33 +91,32 @@ done
 
 log_note "Create a tarball from $TESTDIR1 contents..."
 CWD=$PWD
-cd $TESTDIR1 || log_fail "Could not cd $TESTDIR1"
+log_must cd $TESTDIR1
 log_must tar cf $SNAPSHOT_TARDIR/original.tar .
-cd $CWD || log_fail "Could not cd $CWD"
+log_must cd $CWD
 
 log_note "Create a snapshot and mount it..."
 log_must zfs snapshot $SNAPCTR
 
 log_note "Remove all of the original files..."
-log_must rm -f $TESTDIR1/file* > /dev/null 2>&1
+log_must rm -f $TESTDIR1/file*
 
 log_note "Create tarball of snapshot..."
 CWD=$PWD
-cd $SNAPDIR1 || log_fail "Could not cd $SNAPDIR1"
+log_must cd $SNAPDIR1
 log_must tar cf $SNAPSHOT_TARDIR/snapshot.tar .
-cd $CWD || log_fail "Could not cd $CWD"
+log_must cd $CWD
 
-log_must mkdir $TESTDIR1/original
-log_must mkdir $TESTDIR1/snapshot
+log_must mkdir $TESTDIR1/original mkdir $TESTDIR1/snapshot
 
 CWD=$PWD
-cd $TESTDIR1/original || log_fail "Could not cd $TESTDIR1/original"
+log_must cd $TESTDIR1/original
 log_must tar xf $SNAPSHOT_TARDIR/original.tar
 
-cd $TESTDIR1/snapshot || log_fail "Could not cd $TESTDIR1/snapshot"
+log_must cd $TESTDIR1/snapshot
 log_must tar xf $SNAPSHOT_TARDIR/snapshot.tar
 
-cd $CWD || log_fail "Could not cd $CWD"
+log_must cd $CWD
 
 log_must directory_diff $TESTDIR1/original $TESTDIR1/snapshot
 log_pass "Directory structures match."
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_007_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_007_pos.ksh
index 7ed1fdb6e7ad..41d4b468268b 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_007_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_007_pos.ksh
@@ -49,24 +49,21 @@ function cleanup
 {
 	typeset -i i=1
 	while [ $i -lt $COUNT ]; do
-		snapexists $SNAPCTR.$i
-		if [[ $? -eq 0 ]]; then
-			log_must zfs destroy $SNAPCTR.$i
-		fi
+		snapexists $SNAPCTR.$i && log_must zfs destroy $SNAPCTR.$i
 
-		if [[ -e $SNAPDIR.$i ]]; then
-			log_must rm -rf $SNAPDIR1.$i > /dev/null 2>&1
+		if [ -e $SNAPDIR.$i ]; then
+			log_must rm -rf $SNAPDIR1.$i
 		fi
 
 		(( i = i + 1 ))
 	done
 
-	if [[ -e $SNAPDIR1 ]]; then
-		log_must rm -rf $SNAPDIR1 > /dev/null 2>&1
+	if [ -e $SNAPDIR1 ]; then
+		log_must rm -rf $SNAPDIR1
 	fi
 
-	if [[ -e $TESTDIR ]]; then
-		log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+	if [ -e $TESTDIR ]; then
+		log_must rm -rf $TESTDIR/*
 	fi
 }
 
@@ -74,8 +71,7 @@ log_assert "Verify that many snapshots can be made on a zfs dataset."
 
 log_onexit cleanup
 
-[[ -n $TESTDIR ]] && \
-    log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+[ -n $TESTDIR ] && log_must rm -rf $TESTDIR/*
 
 typeset -i COUNT=10
 
@@ -90,12 +86,11 @@ while [[ $i -lt $COUNT ]]; do
 done
 
 log_note "Remove all of the original files"
-[[ -n $TESTDIR ]] && \
-    log_must rm -rf $TESTDIR1/file* > /dev/null 2>&1
+[ -n $TESTDIR ] && log_must rm -f $TESTDIR1/file*
 
 i=1
 while [[ $i -lt $COUNT ]]; do
-	FILECOUNT=`ls $SNAPDIR1.$i/file* | wc -l`
+	FILECOUNT=`echo $SNAPDIR1.$i/file* | wc -w`
 	typeset j=1
 	while [ $j -lt $FILECOUNT ]; do
 		log_must file_check $SNAPDIR1.$i/file$j $j
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_008_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_008_pos.ksh
index d0ecb77fe0a0..d229c1d74be8 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_008_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_008_pos.ksh
@@ -55,16 +55,14 @@ function cleanup
 		(( i = i + 1 ))
 	done
 
-	[[ -e $TESTDIR ]] && \
-		log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+	[ -e $TESTDIR ] && log_must rm -rf $TESTDIR/*
 }
 
 log_assert "Verify that destroying snapshots returns space to the pool."
 
 log_onexit cleanup
 
-[[ -n $TESTDIR ]] && \
-    log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+[ -n $TESTDIR ] && log_must rm -rf $TESTDIR/*
 
 typeset -i COUNT=10
 
@@ -82,7 +80,7 @@ done
 
 typeset -i i=1
 while [[ $i -lt $COUNT ]]; do
-	log_must rm -rf $TESTDIR/file$i > /dev/null 2>&1
+	log_must rm -f $TESTDIR/file$i
 	log_must zfs destroy $SNAPFS.$i
 
 	(( i = i + 1 ))
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_011_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_011_pos.ksh
index 7e0a7f4ce1d8..fcf57f65f6dd 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_011_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_011_pos.ksh
@@ -53,15 +53,13 @@ function cleanup
 {
 	snapexists $SNAPPOOL && destroy_dataset $SNAPPOOL -r
 
-	[[ -e $TESTDIR ]] && \
-		log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+	[ -e $TESTDIR ] && log_must rm -rf $TESTDIR/*
 }
 
 log_assert "Verify that rollback to a snapshot created by snapshot -r succeeds."
 log_onexit cleanup
 
-[[ -n $TESTDIR ]] && \
-    log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+[ -n $TESTDIR ] && log_must rm -rf $TESTDIR/*
 
 typeset -i COUNT=10
 
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_013_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_013_pos.ksh
index e02f6eb30042..aee6bb6ceb3f 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_013_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_013_pos.ksh
@@ -51,8 +51,7 @@ function cleanup
 	datasetexists $ctrfs && destroy_dataset $ctrfs -r
 	snapexists $snappool && destroy_dataset $snappool -r
 
-	[[ -e $TESTDIR ]] && \
-		log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+	[ -e $TESTDIR ] && log_must rm -rf $TESTDIR/*
 }
 
 log_assert "Verify snapshots from 'snapshot -r' can be used for zfs send/recv"
@@ -67,8 +66,7 @@ snapctrfs=$ctrfs@$TESTSNAP
 fsdir=/$ctrfs
 snapdir=$fsdir/.zfs/snapshot/$TESTSNAP
 
-[[ -n $TESTDIR ]] && \
-    log_must rm -rf $TESTDIR/* > /dev/null 2>&1
+[ -n $TESTDIR ] && log_must rm -rf $TESTDIR/*
 
 typeset -i COUNT=10
 
diff --git a/tests/zfs-tests/tests/functional/snapshot/snapshot_014_pos.ksh b/tests/zfs-tests/tests/functional/snapshot/snapshot_014_pos.ksh
index 384377c7f64b..55188960b7e3 100755
--- a/tests/zfs-tests/tests/functional/snapshot/snapshot_014_pos.ksh
+++ b/tests/zfs-tests/tests/functional/snapshot/snapshot_014_pos.ksh
@@ -48,8 +48,7 @@ verify_runnable "both"
 
 function cleanup
 {
-	[[ -e $TESTDIR1 ]] && \
-		log_must rm -rf $TESTDIR1/* > /dev/null 2>&1
+	[ -e $TESTDIR1 ] && log_must rm -rf $TESTDIR1/*
 
 	snapexists $SNAPCTR && destroy_dataset $SNAPCTR
 
diff --git a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_001_pos.ksh b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_001_pos.ksh
index fe7dff6570a1..b67cc6d973e6 100755
--- a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_001_pos.ksh
+++ b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_001_pos.ksh
@@ -33,7 +33,7 @@ DISK=${DISKS%% *}
 
 log_must zpool create -f $TESTPOOL $DISK
 conf="$TESTDIR/vz001"
-log_must zdb -PC $TESTPOOL > $conf
+log_must eval "zdb -PC $TESTPOOL > $conf"
 
 assert_top_zap $TESTPOOL $DISK "$conf"
 assert_leaf_zap $TESTPOOL $DISK "$conf"
diff --git a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_002_pos.ksh b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_002_pos.ksh
index 01d04ab156db..c571973b080b 100755
--- a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_002_pos.ksh
+++ b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_002_pos.ksh
@@ -33,7 +33,7 @@ log_assert "Per-vdev ZAPs are created on pool creation with many disks."
 log_must zpool create -f $TESTPOOL $DISKS
 
 conf="$TESTDIR/vz002"
-log_must zdb -PC $TESTPOOL > $conf
+log_must eval "zdb -PC $TESTPOOL > $conf"
 
 assert_has_sentinel "$conf"
 for DISK in $DISKS; do
diff --git a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_003_pos.ksh b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_003_pos.ksh
index b6d9ffbda15c..015729576a7d 100755
--- a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_003_pos.ksh
+++ b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_003_pos.ksh
@@ -34,7 +34,7 @@ log_assert "Per-vdev ZAPs are created on pool creation with multi-level vdev "\
 log_must zpool create -f $TESTPOOL mirror $DISKS
 
 conf="$TESTDIR/vz003"
-log_must zdb -PC $TESTPOOL > $conf
+log_must eval "zdb -PC $TESTPOOL > $conf"
 
 assert_has_sentinel "$conf"
 assert_top_zap $TESTPOOL "type: 'mirror'" "$conf"
diff --git a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_004_pos.ksh b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_004_pos.ksh
index b7468e4c331b..86dc058ebffe 100755
--- a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_004_pos.ksh
+++ b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_004_pos.ksh
@@ -38,7 +38,7 @@ log_must zpool create -f $TESTPOOL $DISK
 
 # Make the pool.
 conf="$TESTDIR/vz004"
-log_must zdb -PC $TESTPOOL > $conf
+log_must eval "zdb -PC $TESTPOOL > $conf"
 assert_has_sentinel "$conf"
 orig_top=$(get_top_vd_zap $DISK $conf)
 orig_leaf=$(get_leaf_vd_zap $DISK $conf)
@@ -51,7 +51,7 @@ assert_zap_common $TESTPOOL $DISK "top" $orig_top
 disk2=$(echo $DISKS | awk '{print $2}')
 log_must zpool attach $TESTPOOL $DISK $disk2
 log_must zpool wait -t resilver $TESTPOOL
-log_must zdb -PC $TESTPOOL > $conf
+log_must eval "zdb -PC $TESTPOOL > $conf"
 
 # Ensure top-level ZAP was transferred successfully.
 new_top=$(get_top_vd_zap "type: 'mirror'" $conf)
@@ -80,7 +80,7 @@ dsk2_leaf=$(get_leaf_vd_zap $disk2 $conf)
 #
 
 log_must zpool detach $TESTPOOL $DISK
-log_must zdb -PC $TESTPOOL > $conf
+log_must eval "zdb -PC $TESTPOOL > $conf"
 
 final_top=$(get_top_vd_zap $disk2 $conf)
 final_leaf=$(get_leaf_vd_zap $disk2 $conf)
diff --git a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_005_pos.ksh b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_005_pos.ksh
index 7a40d8f0c565..1d82218bf283 100755
--- a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_005_pos.ksh
+++ b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_005_pos.ksh
@@ -35,7 +35,7 @@ log_must zpool create -f $TESTPOOL $DISK
 
 # Make the pool.
 conf="$TESTDIR/vz005"
-log_must zdb -PC $TESTPOOL > $conf
+log_must eval "zdb -PC $TESTPOOL > $conf"
 assert_has_sentinel "$conf"
 orig_top=$(get_top_vd_zap $DISK $conf)
 orig_leaf=$(get_leaf_vd_zap $DISK $conf)
@@ -50,7 +50,7 @@ log_must zpool export $TESTPOOL
 log_must zpool import $TESTPOOL
 
 # Verify that ZAPs persisted.
-log_must zdb -PC $TESTPOOL > $conf
+log_must eval "zdb -PC $TESTPOOL > $conf"
 
 new_top=$(get_top_vd_zap $DISK $conf)
 new_leaf=$(get_leaf_vd_zap $DISK $conf)
diff --git a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_006_pos.ksh b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_006_pos.ksh
index 0476bcda91ff..ce94336c7c5d 100755
--- a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_006_pos.ksh
+++ b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_006_pos.ksh
@@ -36,7 +36,7 @@ log_assert "Per-vdev ZAPs are created for added vdevs."
 
 log_must zpool add -f $TESTPOOL ${DISK_ARR[1]}
 conf="$TESTDIR/vz006"
-log_must zdb -PC $TESTPOOL > $conf
+log_must eval "zdb -PC $TESTPOOL > $conf"
 
 assert_has_sentinel "$conf"
 orig_top=$(get_top_vd_zap ${DISK_ARR[1]} $conf)
diff --git a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_007_pos.ksh b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_007_pos.ksh
index e04681e67f7d..fbcb807b5fcf 100755
--- a/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_007_pos.ksh
+++ b/tests/zfs-tests/tests/functional/vdev_zaps/vdev_zaps_007_pos.ksh
@@ -36,7 +36,7 @@ log_must zpool create -f $TESTPOOL mirror ${DISK_ARR[0]} ${DISK_ARR[1]}
 
 log_assert "Per-vdev ZAPs persist correctly on the original pool after split."
 conf="$TESTDIR/vz007"
-log_must zdb -PC $TESTPOOL > $conf
+log_must eval "zdb -PC $TESTPOOL > $conf"
 
 assert_has_sentinel "$conf"
 orig_top=$(get_top_vd_zap "type: 'mirror'" $conf)
diff --git a/tests/zfs-tests/tests/functional/zpool_influxdb/zpool_influxdb.ksh b/tests/zfs-tests/tests/functional/zpool_influxdb/zpool_influxdb.ksh
index 495a4a38b7f5..61a85c50280a 100755
--- a/tests/zfs-tests/tests/functional/zpool_influxdb/zpool_influxdb.ksh
+++ b/tests/zfs-tests/tests/functional/zpool_influxdb/zpool_influxdb.ksh
@@ -43,14 +43,11 @@ fi
 
 function check_for
 {
-    grep "^${1}," $tmpfile >/dev/null 2>/dev/null
-    if [ $? -ne 0 ]; then
-        log_fail "cannot find stats for $1"
-    fi
+    log_must grep -q "^${1}," $tmpfile
 }
 
 # by default, all stats and histograms for all pools
-log_must zpool_influxdb > $tmpfile
+log_must eval "zpool_influxdb > $tmpfile"
 
 STATS="
 zpool_io_size
@@ -64,8 +61,8 @@ for stat in $STATS; do
 done
 
 # scan stats aren't expected to be there until after a scan has started
-zpool scrub $TESTPOOL
-zpool_influxdb > $tmpfile
+log_must zpool scrub $TESTPOOL
+log_must eval "zpool_influxdb > $tmpfile"
 check_for zpool_scan_stats
 
 log_pass "zpool_influxdb gathers statistics"
diff --git a/tests/zfs-tests/tests/functional/zvol/zvol_swap/cleanup.ksh b/tests/zfs-tests/tests/functional/zvol/zvol_swap/cleanup.ksh
index 70574fcfe705..f1457b72199e 100755
--- a/tests/zfs-tests/tests/functional/zvol/zvol_swap/cleanup.ksh
+++ b/tests/zfs-tests/tests/functional/zvol/zvol_swap/cleanup.ksh
@@ -46,13 +46,13 @@ fi
 for swapdev in $SAVESWAPDEVS
 do
 	if ! is_swap_inuse $swapdev ; then
-		log_must swap_setup $swapdev >/dev/null 2>&1
+		swap_setup $swapdev
 	fi
 done
 
 voldev=${ZVOL_DEVDIR}/$TESTPOOL/$TESTVOL
 if is_swap_inuse $voldev ; then
-	log_must swap_cleanup $voldev
+	swap_cleanup $voldev
 fi
 
 default_zvol_cleanup