hello all,

Please could someone assist me with a rather simple bash scripting problem I'm having?

I'm trying to create a script to run in cron that will automatically restart a process if it finds that the process has died.

lets assume the following:
1) the program is snort

I tried the following a script, but it does not work.

*********************************************************
#!/bin/bash

if `ps -ef |grep -v grep |grep snort |awk {'print $8'} != "/usr/sbin/snort"
then
snort -c /etc/snort/snort/snort.conf -D -l /var/log/snort
fi
********************************************************
It does'nt work,

If I try:
********************************************************
#!/bin/bash
if [ -n `ps -ef |grep -v grep| grep snort| awk {'print $8'}` ]
then
snort -c /etc/snort/snort/snort.conf -D -l /var/log/snort
fi
*********************************************************

that does'nt work either.

Can someone pickout my obvious mistakes?

Kind Regards,

Gabrieil

Dunno, but here's what I'd try:
#!/bin/bash
# If you don't have /sbin/pidof linked to /sbin/killall5:
# Mimic pidof's "-s" using head -n 1, after all we don't expect multiple snorts running
PID=$(/bin/ps ax | grep snort | grep -v grep | awk {'print $1'} | head -n 1)
# else
# PID=$(/sbin/pidof -s /usr/bin/snort)
if [ "$PID" = "" ]; then <remove-stale-pid command>; <restart command>; fi

Thanks,

but that still does'nt test to see if the daemon has died.
I only want the script to execute if the daemon is dead, identiified by the absense of a running PID.


regards,

Gabriel

Ok, then run the script (w/o quotes) as: "sh -x <scriptname>"
and show me how this does *fill* the PID variable if there is *no* PID for snort to be found...