Handle a signal: Difference between revisions

{{works with|bash}}

Here is a version of the above which assumes that there is a controlling tty device. It exploits the POSIX standard timeout feature of the tty line discipline. Instead of executing a sleep operation, we execute a terminal read with a 5 tenths of a second timeout:

<lang bash>#!/bin/bash

trap 'echo "Run for $((s/2)) seconds"; exit' 2

s=1

half_sec_sleep()

{

local save_tty=$(stty -g)

stty -icanon time 5 min 0

read

stty $save_tty

}

while true

do

echo $s

half_sec_sleep

let s++

done</lang>