Time condition loop in shell

Question

I have just started learning shell script recently, so I don\'t know much about it.

I am trying to find example of time based while loop but not having any luck.

Answer 1

The best way to do this is using the $SECONDS variable, which has a count of the time that the script (or shell) has been running for. The below sample shows how to run a while loop for 3 seconds.

#! /bin/bash
end=$((SECONDS+3))

while [ $SECONDS -lt $end ]; do
    # Do what you want.
    :
done