Need the return codes of the child processes

gururaj · 04-25-2006, 12:00 PM

Hi,

#!/bin/sh
echo "Parallel Processes Start"
a.sh &
b.sh &
echo "Parallel Processes Created"
wait

here a.sh and b.sh are another shell scripts which has exit status as 0 when the scripts executed successfully and 1 for any abnormal termination.

now after wait i have to run c.sh only when both a.sh and b.sh should have returned 0.

Please advise me how to acheive this.

Thanks in advance

macemoneta · 04-25-2006, 04:26 PM

Well, one way is to:

Code:

echo "-1" > /dev/shm/aRC
echo "-1" > /dev/shm/bRC
(a.sh; echo "$?" > /dev/shm/aRC) &
(b.sh; echo "$?" > /dev/shm/bRC) &
wait
if [ "`/bin/cat /dev/shm/aRC`" == "0" ] && [ "`/bin/cat /dev/shm/bRC`" == "0" ]
then
   c.sh
fi
/bin/rm -f /dev/shm/aRC /dev/shm/bRC

Note the '/dev/shm' is a kernel provided shared memory filesystem. You may not have it available, depending on your release or distribution. You can just use disk files in that case.

I'm sure others will chime in with 100 additional ways to accomplish the same thing.