On 4/7/06, Stuart Sears <stuart@xxxxxxxxxxx> wrote: > -----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 Hi Great. That did the job. Sorry I meant "prints nothing to stdout". Many thanks to everyone. Dan
