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Shell Programming and Scripting

Script to run non-stop

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# 15  
Old 11-06-2007
Hi Porter,

Seems like i have to perform the following before the " sleep 1000 " goes away. Why is that so ?

1) kill -9 PID
2) kill -9 PPID
3) kill -9 new_PID
# 16  
Old 11-06-2007
How about not using "kill -9" all the time, it is far too aggressive.

Try

Code:
kill pid

or
Code:
kill -INT pid

or
Code:
kill -QUIT pid

only use -9 as an absolute last resort, it gives the process no opportunity to clear itself up.
# 17  
Old 11-06-2007
hi poter,

Tried all 3. It doesn't go away immediately.

Have to perform the below before the sleep goes away.
But why does the PID and PPID change everytime i execute the kill command ?

1) kill -9 PID
2) kill -9 PPID
3) kill -9 new_PID
# 18  
Old 11-06-2007
I've had a play on Solaris and yes the script is very reluctant to die!

if you kill the script process itself with "-9" it will die but leave the sleep running. Eventually the sleep will timeout and it will die.

When a processes parent (in the case of sleep, it is the shell running the script) it gets reparented to 1.
# 19  
Old 11-06-2007
Hi Porter,

Do you mean if i actually perform a non-stop while loop with my csh script, there is a chance where this process cannot be killed?!?
This is very dangerous.
Any other ways to kill the process ?
# 20  
Old 11-06-2007
Quote:
Originally Posted by Raynon
Do you mean if i actually perform a non-stop while loop with my csh script, there is a chance where this process cannot be killed?!?
"kill -9 pid" WILL kill the process if you are the (a) process owner or (b) root. It's just not the most polite way of doing things.
# 21  
Old 11-06-2007
Thanks porter.

Now i understand.
Your dummy script is actually a non-stop loop.
Once kill is executed, process is killed but it will need to wait for the current "sleep" command to finish performing.
Hope my understanding is correct. Let me know if i am wrong
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