Path: utzoo!utgpu!news-server.csri.toronto.edu!clyde.concordia.ca!uunet!dino!cs.iastate.edu!hascall
From: hascall@cs.iastate.edu (John Hascall)
Newsgroups: comp.misc
Subject: Useful (and clever) pipes
Keywords: ps awk sort comm xargs sh (ULTRIX)
Message-ID: <2405@dino.cs.iastate.edu>
Date: 5 Aug 90 02:03:08 GMT
Sender: usenet@dino.cs.iastate.edu
Organization: Project Vincent, Iowa State University Computation Center
Lines: 19


   Here's a pipe which you can use to make sure that your important
daemons are re-born should they die (stick this in crontab).

   It's all one line, divided here for readability (how it works is
left as an exercise for the reader :-)

      ps -wwt\? | awk 'NR != 1 {print substr($0,21)}' | sort -u |
      comm -13 - /etc/phoenixtab | xargs -l /bin/sh -c

   /etc/phoenixtab is a list of the commands+args you don't want to
go away (SORTED!, 1 per line), like:

      /etc/bootpd -s -d
      /usr/foo/bar-o-matic -kludge
      /usr/lib/lpd

-------------
John Hascall  /  john@iastate.edu  /  hascall@atanasoff.cs.iastate.edu