-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Dan Track wrote: > Hi > > Simple question, I'm running a command `command`, what I'd like to do > is check to see if the response is empty then exit. Does anyone know > how I can perform that check? by empty, I presume you mean 'prints nothing to stdout' ? - you can test the length of a string like this: (man test) if [ -z "$(grep foo /boot/grub/grub.conf)" ] ; then echo "response is empty" exit 1 else echo "response was not empty" fi or do you mean 'command does not work' you can test for a non-zero return code like this: if [ $(grep 'foo' /boot/grub/grub.conf) ]; then echo "yes" else echo "no" fi the two tests are similar but not identical $(command) is exactly the same as `command` any use? Stuart - -- Stuart Sears RHCA RHCX To err is human, to forgive is Not Company Policy. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org iD8DBQFENkwvamPtx1brPQ4RAjs2AJ9DNo8ZcYyEeiMB+Sul5T1PkvHLDQCdETLH yA4OslcedcHH2U4RP4EC4UU= =E42c -----END PGP SIGNATURE-----
