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Shell script for process monitoring

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# 1  
Old 05-31-2011
Shell script for process monitoring
Im having a bit of troble coming up with a script that does this monitors processes to see if they die, if they do die, restart the process
and write out to a log file that the process was restarted with the new PID and the date and time the new process was launched.

Any suggestions?
Last edited by radoulov; 05-31-2011 at 04:06 PM.. Reason: Title fixed
# 2  
Old 05-31-2011
Which OS are you using?

Assuming you want to monitor a process named atd and pidof is available:

Code:
#!/bin/bash

_prg=atd
_logfile=monitor.log

while sleep 60; do                                        # poll every minute ...
  pgrep -f "$_prg" >/dev/null || {                        # if process not available
    start atd  >/dev/null 2>&1                            # start it and log the operation
    printf '[%s] %s started with pid %d at %s\n' \
      "$( date )" "$_prg" $( pgrep -f "$_prg" ) >> "$_logfile"
      }
done

If pgrep is not available, you may try some of these:

Code:
ps -C <your_program> -o pid=

The last option could be something like this (assuming your process is atd):

Code:
ps -eo pid,args= | grep '[a]td' |cut -d\  -f2

Bare in mind, that if you're starting your process in background, its pid will be available in the $! variable (so you won't need all the stuff above).
Last edited by radoulov; 05-31-2011 at 05:36 PM..
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