Hi
I am creating 3 background processes in my shell script using &.
I have obtained the 3 PIDs of the background processes using $!.
I need to wait for these to complete and i need the exit status of each of these.
If i use :
wait $PID1
wait $PID2
wait $PID3
and get the exit status of each of these waits using $?, then by the time i call wait for, say PID3 , it may have already terminated !!
Whereas if i use :
wait $PID1 $PID2 $PID3
then i only get the exit status of PID3
If i use wait without specifying any operands then it exits with status 0 after all the processes have terminated even if one of the processes fails.
I need to know if any of the procs fails. How do I do this in my shell script......can i use waitpid in my shell script and how?
Thanks in advance!