UNIX for Advanced & Expert Users

#!/bin/ksh
LOG_FILE=/tmp/${0##*/}.log
/bin/rm $LOG_FILE


LogMsg() {
 print "$(date +%d/%m/%y:%H:%M:%S) : $@"  >> $LOG_FILE
}

CallA() {
 LogMsg "Calling Function A"
 iostat 5 5  >> $LOG_FILE &
 LogMsg "A done with $!"
 return $!
}

CallB() {
 LogMsg "Calling Function B"
 vmstat 5 5  >> $LOG_FILE &
 LogMsg "B done with $!"
 return $!
}

CallC() {
 LogMsg "Calling Function C"
 prstat 2 5  >> $LOG_FILE &
 LogMsg "C done with $!"
 return $!
}


Main() {
 LogMsg "Starting the Process - Main"
 CallA
 CallB
 CallC
 wait
 LogMsg "Ending the Process - Main"
}

# Call the Main Function here
Main

#!/bin/sh

taskA()
{
    echo taskA

    sleep 5

    echo taskA done
}

taskB()
{
    echo taskB started

    sleep 10

    echo taskB done
}

taskC()
{
    echo taskC started

    sleep 15

    echo taskC done
}

taskA &
taskB &
taskC &

echo spawned all

wait

echo done