4 files changed, 29 insertions, 22 deletions
diff --git a/bin/sync/Makefile b/bin/sync/Makefile
index 8b56d6af4b88..8da077108aec 100644
--- a/bin/sync/Makefile
+++ b/bin/sync/Makefile
@@ -1,5 +1,3 @@
-#	@(#)Makefile	8.1 (Berkeley) 5/31/93
-# $FreeBSD$
 
 PACKAGE=runtime
 PROG=	sync
diff --git a/bin/sync/Makefile.depend b/bin/sync/Makefile.depend
index cae7e645ef6a..93249906da4f 100644
--- a/bin/sync/Makefile.depend
+++ b/bin/sync/Makefile.depend
@@ -1,8 +1,6 @@
-# $FreeBSD$
 # Autogenerated - do NOT edit!
 
 DIRDEPS = \
-	gnu/lib/csu \
 	include \
 	lib/${CSU_DIR} \
 	lib/libc \
diff --git a/bin/sync/sync.8 b/bin/sync/sync.8
index 7f331f1222e3..fcd07ca72240 100644
--- a/bin/sync/sync.8
+++ b/bin/sync/sync.8
@@ -26,10 +26,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.\"	@(#)sync.8	8.1 (Berkeley) 5/31/93
-.\" $FreeBSD$
-.\"
-.Dd May 31, 1993
+.Dd April 25, 2024
 .Dt SYNC 8
 .Os
 .Sh NAME
@@ -72,3 +69,31 @@ A
 .Nm
 utility appeared in
 .At v4 .
+.Pp
+On systems older than
+.Bx 4.0 ,
+commands like
+.Xr reboot 8
+and
+.Xr halt 8
+were unavailable.
+The shutdown procedure involved running
+.Nm ,
+waiting for the lights to stop,
+and turning off the machine.
+.Pp
+Issuing three separate
+.Nm
+commands (one line each) was a placebo that would generally suffice in
+.At v7
+machines that were otherwise quiesced systems.
+It replaced the one-per-line
+.Nm
+as a substitute for waiting.
+.Pp
+.Bx 4.0
+introduced
+.Xr reboot 2
+and
+.Xr sync 2
+which rendered this trick obsolete.
diff --git a/bin/sync/sync.c b/bin/sync/sync.c
index 6855193a0476..7560e794d35f 100644
--- a/bin/sync/sync.c
+++ b/bin/sync/sync.c
@@ -27,20 +27,6 @@
  * SUCH DAMAGE.
  */
 
-#if 0
-#ifndef lint
-static char const copyright[] =
-"@(#) Copyright (c) 1987, 1993\n\
-	The Regents of the University of California.  All rights reserved.\n";
-#endif /* not lint */
-
-#ifndef lint
-static char sccsid[] = "@(#)sync.c	8.1 (Berkeley) 5/31/93";
-#endif /* not lint */
-#endif
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
 #include <stdlib.h>
 #include <unistd.h>