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doc: -f is now portable for cp and ln

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This follows up on a comment by Glenn Morris in:
http://lists.gnu.org/archive/html/emacs-devel/2015-01/msg00011.html
* doc/autoconf.texi (Limitations of Usual Tools):
Remove circa-1990 advice about avoiding cp -f and ln -f.
Although that advice was reasonable for the early 1990s, the -f
option is portable for both cp and ln nowadays.  These options
were standardized in POSIX 1003.2-1992, and pre-POSIX systems such
as SunOS 4 are no longer of practical concern.
This commit is contained in:
Paul Eggert 2015-01-02 13:02:48 -08:00
parent 3d6479f6ae
commit 4774ff5c33
1 changed files with 5 additions and 5 deletions
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doc/autoconf.texi
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@ -18684,9 +18684,7 @@ avoid this problem, omit the trailing slashes. For example, use
@samp{cp -R source /tmp/newdir} rather than @samp{cp -R source
/tmp/newdir/} if @file{/tmp/newdir} does not exist.
@c This is thanks to Ian.
The ancient SunOS 4 @command{cp} does not support @option{-f}, although
its @command{mv} does.
The @option{-f} option is portable nowadays.
@cindex timestamp resolution
Traditionally, file timestamps had 1-second resolution, and @samp{cp
@ -19088,9 +19086,11 @@ the workaround is to use @command{join -a1 file1 file2} instead.
@item @command{ln}
@c ---------------
@prindex @command{ln}
The @option{-f} option is portable nowadays.
@cindex Symbolic links
Don't rely on @command{ln} having a @option{-f} option. Symbolic links
are not available on old systems; use @samp{$(LN_S)} as a portable substitute.
Symbolic links are not available on some systems; use @samp{$(LN_S)} as
a portable substitute.
For versions of the DJGPP before 2.04,
@command{ln} emulates symbolic links