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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

atd

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

NAME

       atd - run jobs queued for later execution

SYNOPSIS

       atd [-l load_avg] [-b batch_interval] [-d] [-f] [-s]

DESCRIPTION

       atd runs jobs queued by at(1).

OPTIONS

       -l      Specifies  a  limiting load factor, over which batch jobs should not be run, instead of the compile-time choice of 0.8.	For an SMP
	       system with n CPUs, you will probably want to set this higher than n-1.

       -b      Specify the minimum interval in seconds between the start of two batch jobs (60 default).

       -d      Debug; print error messages to standard error instead of using syslog(3).  This option also implies -f.

       -f      Run atd in the foreground.

       -s      Process the at/batch queue only once.  This is primarily of use for compatibility with old versions of at; atd -s is equivalent	to
	       the old atrun command.

WARNING

       atd won't work if its spool directory is mounted via NFS even if no_root_squash is set.

FILES

       /var/spool/at The directory for storing jobs; this should be mode 700, owner root.

       /var/spool/at/spool The directory for storing output; this should be mode 700, owner root.

       /etc/at.allow, /etc/at.deny determine who can use the at system.

SEE ALSO

       at(1), at.deny(5), at.allow(5), cron(8), crontab(1), syslog(3).

BUGS

       The functionality of atd should be merged into cron(8).

								    2009-11-14								    ATD(8)
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