rename: notice when expression and replacement are the same string

The rename(1) can exit early when replace expression and replacement are
identical string.  It is also appropriate to change return value in this
case to 'nothing was renamed'.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>

diff --git a/misc-utils/rename.c b/misc-utils/rename.c
index b06a2d969b3f5d00910ba1900dff17d7ff27a5d0..8230ac3da02a11d40671dc4ed6d49bc99ac805f7 100644 (file)
--- a/misc-utils/rename.c
+++ b/misc-utils/rename.c
@@ -204,6 +204,9 @@ int main(int argc, char **argv)
        from = argv[0];
        to = argv[1];
 
+       if (!strcmp(from, to))
+               return RENAME_EXIT_NOTHING;
+
        for (i = 2; i < argc; i++)
                ret |= do_rename(from, to, argv[i], verbose, noact, nooverwrite);