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doc: update ‘find’ info

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* doc/autoconf.texi (Limitations of Usual Tools):
Mention a few more GNU ‘find’ options that are not portable.
Modernize a bit.
This commit is contained in:
Paul Eggert 2021-10-09 18:38:25 -07:00
parent 6027e99358
commit 407d5955f0
1 changed files with 9 additions and 4 deletions
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doc/autoconf.texi
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@ -19500,13 +19500,17 @@ Tru64/OSF 5.1 @command{fgrep} does not match an empty pattern.
@item @command{find}
@c -----------------
@prindex @command{find}
The @option{-maxdepth} option seems to be GNU specific.
Tru64 v5.1, NetBSD 1.5 and Solaris @command{find}
commands do not understand it.
Many operands of GNU @command{find} are not standardized by Posix and
are missing on many platforms. These nonportable operands include
@option{-follow}, @option{-maxdepth}, @option{-mindepth},
@option{-printf}, and @option{,}. See the
@uref{https://@/pubs.opengroup.org/@/onlinepubs/@/9699919799/@/utilities/@/find.html,
Posix spec for @command{find}} for @command{find} operands that
should be portable nowadays.
The replacement of @samp{@{@}} is guaranteed only if the argument is
exactly @emph{@{@}}, not if it's only a part of an argument. For
instance on DU, and HP-UX 10.20 and HP-UX 11:
instance, on HP-UX 11:
@example
$ @kbd{touch foo}
@ -19516,6 +19520,7 @@ $ @kbd{find . -name foo -exec echo "@{@}-@{@}" \;}
@noindent
while GNU @command{find} reports @samp{./foo-./foo}.
Posix allows either behavior.
@anchor{grep}