Shell Programming and Scripting

for i in 1 2 3 4 5 6 7 8 9 10
do
child_script $i &
done

wait

#!/bin/ksh
P_PID=$$
for i in 1 2 3 4 5 6 7 8 9 10
do
child_script $i $P_PID &
done
wait

#!/bin/ksh
some code of child
ret_stat=$?
if [ "$ret_stat" -ne "0" ]
then
kill $2
fi

for i in 1 2 3 4 5; do { sleep $i; ls file$i; } & done; jobs; for i in 1 2 3 4 5; do wait %$i; echo $?; done
[1] 7865
[2] 7866
[3] 7867
[4] 7869
[5] 7870
[1]   Running                 { sleep $i; ls file$i; } &
[2]   Running                 { sleep $i; ls file$i; } &
[3]   Running                 { sleep $i; ls file$i; } &
[4]-  Running                 { sleep $i; ls file$i; } &
[5]+  Running                 { sleep $i; ls file$i; } &
file1
[1]   Done                    { sleep $i; ls file$i; }
0
file2
[2]   Done                    { sleep $i; ls file$i; }
0
file3
[3]   Done                    { sleep $i; ls file$i; }
0
file4
[4]-  Done                    { sleep $i; ls file$i; }
0
ls: cannot access 'file5': No such file or directory
[5]+  Exit 2                  { sleep $i; ls file$i; }
2

files="test test2 "
pids=""
exit_counter=0
for i in $files; do
    ./test2 $i &
    p_pid="$!"
    echo "$i  process id is : $p_pid"
    pids+="$p_pid "
done
jobs -p
for pid in $pids; do
    wait $pid
    if [ $? -eq 0 ]; then
        echo "SUCCESS - Job $pid exited with a status of $?"
    else
        echo "FAILED - Job $pid exited with a status of $?"
        exit_counter=`expr "$exit_counter" + 1 `
        echo "EXIT COUNTER : $exit_counter"
    fi
done
if [ $exit_counter -ne 0 ]
then
  exit "$exit_counter"
fi