05.01.2003 21:23:16, "Egor Tur" <[EMAIL PROTECTED]> wrote: >Hi. >Who can explain? >ps ax | grep lpd > 398 ? S 0:00 lpd Waiting > 5593 pts/13 S 0:00 grep lpd >ps ax | grep [l]pd > 398 ? S 0:00 lpd Waiting > >What do [l]?
That is more a grep question than a a bash question. grep has a special meaning for [...], i.e match any character found inside the brackets (also known as character class). So "grep [l]pd" will match "lpd" but not "[l]pd" and thus leave out the match for grep itself. Nice trick. I usually used ps ax | grep lpd | grep -v grep but with that trick, I can shortcut things from now on. HTH, Michael -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
