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Start/Stop process when a file is modified.

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# 1  
Old 01-14-2010
Start/Stop process when a file is modified.
I have a file which is modified via a web application & this may happen during any time of the day/week. This file is being used a config/list file for another shell script which runs 24hrs with a sleep of 200 secs.

I have writted a small script to kill the shell script when this config file is modified.

Let me know if there are any modifications to be made.

Code:
 
#!/bin/sh
x='find . -mmin +15 | grep configfile| wc -l'
PID='ps -ef | grep process.sh | grep -v grep | awk '{print $2}''
 
while :; do
     if [ x -eq 1 ]
   then
          kill -9 $PID
   sleep 30
          break
     fi
done
./process.sh
exit 0

# 2  
Old 01-14-2010
Code:
kill -9 $PID

You get a Useless Use of kill -9 award! Smilie To wit:

Quote:
No no no. Don't use kill -9.

It doesn't give the process a chance to cleanly:

1) shut down socket connections

2) clean up temp files

3) inform its children that it is going away

4) reset its terminal characteristics

and so on and so on and so on.

Generally, send 15, and wait a second or two, and if that doesn't
work, send 2, and if that doesn't work, send 1. If that doesn't,
REMOVE THE BINARY because the program is badly behaved!

Don't use kill -9. Don't bring out the combine harvester just to tidy
up the flower pot.
If you're on linux, the killall command may be useful to kill a process by executable name instead of grepping awkward stuff to find it. On other systems though, killall has a completely different and absolutely literal functionality. Smilie
# 3  
Old 01-14-2010
The process which is killed is a shell script which runs to collect config statistics.
You mean to say that I can use killall PID instead of kill -9 PID.
# 4  
Old 01-14-2010
Quote:
Originally Posted by Lancel0t
The process which is killed is a shell script which runs to collect config statistics.
You mean to say that I can use killall PID instead of kill -9 PID.
I told you two separate things.

1) Don't use kill -9. Use other signals than 9 unless absolutely necessary for all the reasons listed above.

2) the killall command on linux(but ONLY on linux) will let you kill a process by name without having to grep for it.
# 5  
Old 01-14-2010
Couldn't you modify your "process.sh" to check if the config file has been modified.
That because it sleeps 200 secs and ther is no need to check every 30 secs.
Or have i misunderstood ?
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