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Kill child processes, when parent is "bash"

 
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Top Forums UNIX for Dummies Questions & Answers Kill child processes, when parent is "bash"
# 1  
Old 12-02-2009
Error Kill child processes, when parent is "bash"
Consider this simple command line
Code:
bash -c  'echo $$ ; sleep 10000'

This will print the newly created bash PID and sleep for a long time.
If I go to another terminal and do something like
Code:
ps -flax | grep [s]leep

I'll see something like
Code:
501 92418 91910   0   0:00.00 ttys000    0:00.00 bash -c echo $$ ; sleep 10000                                       4002  31  0    75964    708 -      S+   c8be82c
501 92419 92418   0   0:00.00 ttys000    0:00.00 sleep 10000                                                         4002  31  0    75412    380 -      S+   affa338

If I do kill then the parent (bash) process
Code:
kill 92418

then the child process (sleep) is not killed, although bash got killed

How do I kill the whole tree?
# 2  
Old 12-02-2009
So you could kill the child process (which has the PPID = bash's PID) before you kill bash.
# 3  
Old 12-02-2009
I know that I can programmatically parse the whole tree and recursively kill all children.
But it seems to me that this is has a big overhead.

Isn't there any other way to do it?
I thought this was the default behaviour, the childer to be killed when the parent gets killed.
# 4  
Old 12-03-2009
Actually, killing a parent process will usually, but not always, kill its children as well !
# 5  
Old 12-04-2009
Thank you for your answer, I thought this was the rule.
In any case I solved the problem with another way.
Thanks again
# 6  
Old 03-05-2010
Here a script to kill recursive, I named it rkill.sh, it search for PPIDs recursively using pgrep:

Code:
#!/bin/bash

### Current PID, if this script try to self search, then will loop forever
pid=$$

### Recursive function
search()
{
    if [ $1 == $pid ]; then
        break
    fi

    pgrep -P $1 |
    while read process; do
        echo $process ### Print PID to stdout for debug, replace by your kill command (kill -9, pkill, etc)
        search $process
    done
}

search $1

Last edited by wagnerluis1982; 03-05-2010 at 03:15 PM..
 
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