90% of the time it doesn't matter, but yes Dave's way is less IO intensive. Rob Marti -----Original Message----- From: redhat-list-bounces@xxxxxxxxxx [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of Dave Ihnat Sent: Tuesday, August 18, 2009 8:44 AM To: General Red Hat Linux discussion list Subject: Re: test for directory On Tue, Aug 18, 2009 at 06:41:30AM -0700, Yong Huang wrote: > > Or, maybe less expensive: > > > > if [ \( -d /etc \) -a \( -d /home \) ]; then echo "Yes."; fi > Can you explain why it's less expensive? When you use a bracket, you're spawning a subshell. Cheers, -- Dave Ihnat dihnat@xxxxxxxxxx -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
