-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 According to Com MN PG P E B Consultant 3 on 8/28/2006 2:41 AM: > $ unalias fooee 2>&1 >/dev/null > bash: unalias: fooee: not found > > Why is the error message displayed here? Because of the redirection, > I had expected that any error message resulting from the unalias > command would go to /dev/null
Your redirection operators are wrong - you asked bash to copy stderr to the existing stdout, then silence stdout, but since the copy already took place, you are not silencing stderr. So error messages are going to the original stdout, not /dev/null. Try this instead: $ unalias foo >/dev/null 2>&1 Also, if you want to be portable, remember that unalias is a builtin, but that it is optional. The only way to portably silence error messages when your script is designed to run with other shells (such as ash) is to use a subshell to test whether it will work first: $ (unalias foo) >/dev/null 2>&1 && unalias foo - -- Life is short - so eat dessert first! Eric Blake [EMAIL PROTECTED] -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.1 (Cygwin) Comment: Public key at home.comcast.net/~ericblake/eblake.gpg Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFE8toZ84KuGfSFAYARAnCHAJ9ZuW980IB+xVTpn5/PEfk/EgUOIACcDR2c zpYhYp0Pf9vmrta/wJynbj8= =+76q -----END PGP SIGNATURE----- _______________________________________________ Bug-bash mailing list Bug-bash@gnu.org http://lists.gnu.org/mailman/listinfo/bug-bash
