Shell Programming and Scripting

Dear Unix Gurus,
Here is my query.
If i start a script,it inturn calls many other scripts ..and most of them continue to run in parallel.

Suppose,if i want to stop my script for some reason,i need to kill -9 each of the processes running.It becomes clumsy if the sub processes r more.

But,i feel should there b some way wherein if i kill my parent (initial) process..all the subs from it has 2 b killed.

Currently we r doing it in the below ways.

- Kill -9 <all the processes> (need 2 copy&paste all the pids from ps -fu <uid> command)

-kill the shell/session - But this terminates the session/window.

I m thinking 2 write a small utility using awk 4 it..if any such cmd doesnt exist.
Before that,i just want make sure if there is any cmd 4 it r not.

Can any one of u throw some light on this thread.

Thanks in advance,
Venkat.

See the following use of pstree

Code:

[/tmp]$ cat 1.sh
#! /bin/sh 
echo ----
/tmp/"2.sh"
[/tmp]$ cat 2.sh
#! /bin/sh
/tmp/3.sh
sleep 10
[/tmp]$ cat 3.sh
#! /bin/sh
sleep 10
[/tmp]$ ./1.sh
[/tmp]$ ----

Code:

[/tmp]$ ps x
31599 pts/11   S      0:00 /bin/sh ./1.sh
31600 pts/11   S      0:00 /bin/sh /tmp/2.sh
31601 pts/11   S      0:00 /bin/sh /tmp/3.sh
31602 pts/11   S      0:00 sleep 10
31603 pts/15   R      0:00 ps x
[~]$ pstree -p 31599
1.sh(31599)---2.sh(31600)---3.sh(31601)---sleep(31602)
[~]$

Vino

Vino,
Thx for the quick reply.
pstree lists all the pids of sub processes with pnames.

anyhow,we need 2 again manually pick-up those pids and kill.right?

after pstree...we can procees that list usoing any of the utilities and pick only the pids and pipe the 2 xargs.

I think this way ll b fine..right?

or pls suggest me if there is a better way.

Thanks,
Venkat (BEA Systems).

After you get the pids from pstree, you dont need xargs.

You can do

Code:

kill -9 31599 31600 31601 31602

Let me make it clear.

I want 2 avoid manullly picking up those ids and killing.

if its less,manual is ok.

but is its more (say > 20), it takes bit time time.right?

instead we can process the o/p pf pstree and extract only pids (omit pnames)...then do xargs kill on the list.

Does that makes sense?

Pls let me know..

Thanks,
Venkat @ BEA.

check whether this works ?

ptree pid |sed 's/^[ ]*\(.*\) \/.*/\1/' | xargs kill

Code:

#! /bin/ksh

PSTREE="1.sh(31599)---2.sh(31600)---3.sh(31601)---sleep(31602)"

PIDS=$(echo "$PSTREE" | grep -o '[0-9]\{2,5\}')

for pid in "$PIDS"
do
# Subsitute kill -0 with kill -9
kill -0 $pid
done