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Date: Wed, 23 Apr 1997 17:50:46 -0500
From: Lee Crites <leec@adonai.net>
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Organization: Adonai Enterprises, Inc
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To: Dan Wolfe <DWolfe@ZYGA.com>
CC: "'questions@freebsd.org'" <questions@freebsd.org>,
        "'dsmith@zyga.com'" <dsmith@ZYGA.com>
Subject: Re: Cron jobs
References: <01BC4FF0.6D7EC0A0@dans-zyga-pc.zyga.com>
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Dan Wolfe wrote:
> 
> FreeBSD Users:
> 
> Has anyone written a script to periodically check if a particular process is running, and if not, restart it?
> 
> -Dan Wolfe
> ZYGA Corporation

Try this script on for size, it's working for me, anyway...

#!/bin/csh -f
#
# check for program and start it if it is not found
#
  echo "Check/starting process"

#
# program name should be $1
#
  if ($1 == "") then
    echo "usage: $0 program-to-check"
    exit
    endif

  set STR = $1
  echo " -- starting "$STR

#
# see if it is running and start it if needed
#
  if (`ps -aux|grep -v grep|grep -c $STR` == 0) then

    echo " -- starting process"
    $STR >>& /dev/null &

  else

    echo " -- process already running"

  endif

#
# done
#