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doc: modernize grep discussion

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Paul Eggert 2020-12-29 22:48:02 -08:00 committed by Zack Weinberg
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@ -19282,8 +19282,8 @@ dir=`AS_DIRNAME(["$file"])` # This is more portable.
@item @command{egrep}
@c ------------------
@prindex @command{egrep}
Posix 1003.1-2001 no longer requires @command{egrep},
but many hosts do not yet support the Posix
Although Posix stopped requiring @command{egrep} in 2001,
a few traditional hosts (notably Solaris) do not support the Posix
replacement @code{grep -E}. Also, some traditional implementations do
not work on long input lines. To work around these problems, invoke
@code{AC_PROG_EGREP} and then use @code{$EGREP}.
@ -19468,8 +19468,8 @@ expr: More than one '\(' was used.
@item @command{fgrep}
@c ------------------
@prindex @command{fgrep}
Posix 1003.1-2001 no longer requires @command{fgrep},
but many hosts do not yet support the Posix
Although Posix stopped requiring @command{fgrep} in 2001,
a few traditional hosts (notably Solaris) do not support the Posix
replacement @code{grep -F}. Also, some traditional implementations do
not work on long input lines. To work around these problems, invoke
@code{AC_PROG_FGREP} and then use @code{$FGREP}.
@ -19510,7 +19510,7 @@ portable scripts should not combine @option{-c} with @option{-l},
as Posix does not allow this.
Some of the options required by Posix are not portable in practice.
Don't use @samp{grep -q} to suppress output, because many @command{grep}
Don't use @samp{grep -q} to suppress output, because traditional @command{grep}
implementations (e.g., Solaris) do not support @option{-q}.
Don't use @samp{grep -s} to suppress output either, because Posix
says @option{-s} does not suppress output, only some error messages;
@ -19528,7 +19528,7 @@ Some traditional @command{grep} implementations do not work on long
input lines. On AIX the default @code{grep} silently truncates long
lines on the input before matching.
Also, many implementations do not support multiple regexps
Also, traditional implementations do not support multiple regexps
with @option{-e}: they either reject @option{-e} entirely (e.g., Solaris)
or honor only the last pattern (e.g., IRIX 6.5 and NeXT). To
work around these problems, invoke @code{AC_PROG_GREP} and then use