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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
Old 02-13-2011
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.
 

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ntp-wait(1)							   User Commands						       ntp-wait(1)

NAME
ntp-wait - Wait for ntpd to stabilize the system clock SYNOPSIS
ntp-wait [-flags] [-flag [value]] [--option-name[[=| ]value]] All arguments must be options. DESCRIPTION
ntp-wait will send at most num-tries queries to ntpd(8), sleeping for secs-between-tries after each status return that says ntpd(8) has not yet produced a synchronized and stable system clock. ntp-wait will do this quietly, unless the -v flag is provided. This can be useful at boot time, to delay the boot sequence until after ntpd -g has set the time. OPTIONS
-n number, --tries=number Number of times to check ntpd. This option takes an integer number as its argument. The default number for this option is: 100 The maximum number of times we will check ntpd to see if it has been able to synchronize and stabilize the system clock. -s secs-between-tries, --sleep=secs-between-tries How long to sleep between tries. This option takes an integer number as its argument. The default secs-between-tries for this option is: 6 We will sleep for secs-between-tries after each query of ntpd that returns "the time is not yet stable". -v, --verbose Be verbose. By default, ntp-wait is silent. With this option, ntp-wait will provide status information. -?, --help Display usage information and exit. -!, --more-help Pass the extended usage information through a pager. -v [{v|c|n --version [{v|c|n}]}] Output version of program and exit. The default mode is `v', a simple version. The `c' mode will print copyright information and `n' will print the full copyright notice. EXIT STATUS
One of the following exit values will be returned: 0 (EXIT_SUCCESS) Successful program execution. 1 (EXIT_FAILURE) The operation failed or the command syntax was not valid. 70 (EX_SOFTWARE) libopts had an internal operational error. Please report it to autogen-users@lists.sourceforge.net. Thank you. AUTHORS
Harlan Stenn NOTES
This document corresponds to version 4.2.8p13 of NTP. This manual page was AutoGen-erated from the ntp-wait option definitions. ntp (4.2.8p13) 20 Feb 2019 ntp-wait(1)
All times are GMT -4. The time now is 09:52 AM.
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