Shell Programming and Scripting

kill -l

#!/bin/ksh
trap 'echo "control/c ignored" ' INT

#!/bin/ksh  # or bash
sig=0
while (( sig < 30 ))
do
        trap "echo sig:$sig " $sig
        (( sig+=1 ))
done

while true
do
        echo "my pid is $$"
        echo "use: kill -N $$"
        echo " - N is 0-29"
        sleep 60
done

realexit() 
{
   echo "int EXIT has done"
}

ctrlc() 
{       
   echo "int INT (ctrl-C)"
   echo "end this script"
   exit
}
        
trap 'realexit' EXIT
trap 'ctrlc' INT 
trap ':' HUP QUIT  # nop - do nothing - process continue

while true
do
    date
    echo "proc:$$"
    sleep 30
done