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| author | Paul Eggert <eggert@cs.ucla.edu> | 2015-01-02 13:02:48 -0800 |
|---|---|---|
| committer | Paul Eggert <eggert@cs.ucla.edu> | 2015-01-02 13:03:39 -0800 |
| commit | 4774ff5c33d34bb6ad21c06f3c2b54d6e700740e (patch) | |
| tree | 9d403b537361457f1448be7379f4bda8a825997a | |
| parent | 3d6479f6ae9305fded5e5bd08c858c16484ea620 (diff) | |
| download | autoconf-4774ff5c33d34bb6ad21c06f3c2b54d6e700740e.tar.gz | |
doc: -f is now portable for cp and ln
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.
| -rw-r--r-- | doc/autoconf.texi | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/doc/autoconf.texi b/doc/autoconf.texi index 639cec27..d9e833da 100644 --- a/doc/autoconf.texi +++ b/doc/autoconf.texi @@ -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 |