On Wednesday 29 May 2002 11:29 am, you wrote: > begin nbs <[EMAIL PROTECTED]> > > On Wed, May 29, 2002 at 11:11:19AM -0700, Peter Jay Salzman wrote: > > > this redirects stderr to stdout and pipes the whole thing to grep: > > > strace lsof 2>&1 | grep System > > Try something like: > > strace lsof 2>&1 1> /dev/null | grep > > ok, haven't tried this, but this looks to me like: > > put stderr into stdout > redirect stdout (and therefore stderr) into /dev/null > pipe stdout (which should be null) to grep. > > yet it works. where is my thinking going wrong?
here's my reading of the man page. redirects are processed L->R. "2>&1" *duplicates* the stdout file descriptor and sends stderr there. then stdout (the original) is redirected to /dev/null. so this is what you needed. reversing the order sends stdout to /dev/null, *then* duplicates the stdout file descriptor and sends stderr there, so it too ends up in /dev/null. not what you wanted. shawn. _______________________________________________ vox-tech mailing list [EMAIL PROTECTED] http://lists.lugod.org/mailman/listinfo/vox-tech
