Creating a daemon to run in background Post: 302496270

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Top Forums Shell Programming and Scripting Creating a daemon to run in background Post 302496270 by jim mcnamara on Sunday 13th of February 2011 07:50:03 AM

02-13-2011

Registered User

Code:

while true
do
 ps auxww | egrep [m]ember.cgi | awk '{print $2}' | 
 while read PID; 
 do 
    ( sleep 2 && kill -0 $PID && kill -9 $PID )  &  # wait 2 secs, test for pid again, kill it
 done;
 wait               # wait for all of the  ( sleep 2 .... ) & above child processes to complete
 sleep 1           # give the cpu a break
done

This whole approach is not a great idea. Shell daemons have security issues, for one thing. I added a sleep 1 so this thing is not gobbling up cpu all day. The wait statement makes the process wait until all of the pids have been processed.

The while true loop is an infinite loop. Instead of that loop consider using cron, maybe an entry like this:

Code:

* * * * * /path/to/Kill_Daemon.sh

This runs the code every minute. You can lose the while true loop and the sleep 1 if you do this.

jim mcnamara

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LEARN ABOUT LINUX

service

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

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
       directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script,  service  passes  COMMAND and OPTIONS it to the init script unmodified.  All scripts should support at least the start and
       stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the  start
       command.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)