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Full Discussion: Shell script for process monitoring
Top Forums Shell Programming and Scripting Shell script for process monitoring Post 302526467 by radoulov on Tuesday 31st of May 2011 03:12:52 PM
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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LEARN ABOUT CENTOS

runsvdir

runsvdir(8)                                                   System Manager's Manual                                                  runsvdir(8)

NAME

       runsvdir - starts and monitors a collection of runsv(8) processes

SYNOPSIS

       runsvdir [-P] dir [ log ]

DESCRIPTION

       dir must be a directory.  log is a space holder for a readproctitle log, and must be at least seven characters long or absent.

       runsvdir  starts  a runsv(8) process for each subdirectory, or symlink to a directory, in the services directory dir, up to a limit of 1000
       subdirectories, and restarts a runsv(8) process if it terminates.  runsvdir skips subdirectory names starting with dots.  runsv(8) must  be
       in runsvdir's PATH.

       At  least every five seconds runsvdir checks whether the time of last modification, the inode, or the device, of the services directory dir
       has changed.  If so, it re-scans the service directory, and if it sees a new subdirectory, or new symlink to a directory, in dir, it starts
       a  new  runsv(8)  process;  if  runsvdir  sees  a subdirectory being removed that was previously there, it sends the corresponding runsv(8)
       process a TERM signal, stops monitoring this process, and so does not restart the runsv(8) process if it exits.

       If the log argument is given to runsvdir, all output to standard error is redirected to this log, which  is  similar  to  the  daemontools'
       readproctitle  log.   To  see the most recent error messages, use a process-listing tool such as ps(1).  runsvdir writes a dot to the read-
       proctitle log every 15 minutes so that old error messages expire.

OPTIONS

       -P     use setsid(2) to run each runsv(8) process in a new session and separate process group.

SIGNALS

       If runsvdir receives a TERM signal, it exits with 0 immediately.

       If runsvdir receives a HUP signal, it sends a TERM signal to each runsv(8) process it is monitoring and then exits with 111.

SEE ALSO

       sv(8), runsv(8), runsvchdir(8), runit(8), runit-init(8), chpst(8), svlogd(8), utmpset(8), setsid(2)

       http://smarden.org/runit/

AUTHOR

       Gerrit Pape <pape@smarden.org>

                                                                                                                                       runsvdir(8)
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