Please fix the third command, $ echo -e 'a1\nb2\nc3\nb2'|sort -n|sort -u a1 b2 c3 $ echo -e 'a1\nb2\nc3\nb2'|sort -u|sort -n a1 b2 c3 $ echo -e 'a1\nb2\nc3\nb2'|sort -nu a1
or warn right there on the man page. Sure, you say -u, --unique with -c, check for strict ordering; without -c, output only the first of an equal run but still warn that the above will happen if one tries to combine anything with -u. _______________________________________________ Bug-coreutils mailing list Bug-coreutils@gnu.org http://lists.gnu.org/mailman/listinfo/bug-coreutils