On Fri, 2006-04-07 at 12:28 +0100, Dan Track wrote: > On 4/7/06, Paul Howarth <paul@xxxxxxxxxxxx> wrote: > > 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? > > > > Exit if "command" produces no output: > > [ -z "$(command)" ] && exit > > > > Hi > > When I do 'man bash' I can't find any instance of -z, any ideas where > it came from? > -z is one of the options to test man test [] is an alias for test > Dan >
