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These utilities can only function correctly if implemented as shell
builtins and exist only because POSIX previously required them. As of
POSIX 2024, they have all been reclassified as intrinsic utilities and
are no longer required to exist in PATH. We can therefore retire them.
Cf. XBD 1.7, XRAT C.1.8, Austin Group bug 854.
Note that kill(1) is also considered an intrinsic utility (because
only the shell can interpret job IDs correctly), but we have a working
standalone implementation, which we will keep.
PR: 291686
Relnotes: yes
Reviewed by: imp, emaste
Differential Revision: https://reviews.freebsd.org/D54239
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Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/
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command is handled as a shell function. This avoids the following
peculiar behaviour when /usr/bin is on a case-insensitive filesystem:
# READ foo
(... long pause, depending upon the amount of swap space available ...)
sh: Resource temporarily unavailable.
Reported by: I can't remember; someone on IRC.
MFC after: 1 week
Notes:
svn path=/head/; revision=151635
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implement any of the useless POSIX-required ``regular shell builtin''
utilities, saving one frag and one inode each. The script moves to
usr.bin/alias which is alphabetically the first of these commands.
Notes:
svn path=/head/; revision=100200
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