#!/bin/bash
# Cyril Pawelko http://www.pawelko.net/check-mk-check_pid/ 
# Version 1
# checks the PID referenced in a PIDFILE exists
# This is a "local" check_mk check for *NIX:
# - Rename it if you need several checks on the same host
# - Copy to check-mk local checks directory (/usr/lib/check_mk_agent/local on Debian)

# Customize with the PID file path:
PIDFILE="/opt/zimbra/data/postfix/spool/pid/master.pid"

if [ ! -r $PIDFILE ]
 then echo 3 Pid_$PIDFILE - File $PIDFILE cannot be read
 exit
fi

PID=$(cat $PIDFILE  )
PID=${PID//[^0-9]/}
if ps $PID > /dev/null
 then echo 0 Pid_$PIDFILE - Process $PID referenced in $PIDFILE is running
 else echo 2 Pid_$PIDFILE - Process $PID referenced in $PIDFILE does not exist
fi