Reading input in bash in an infinite loop and reacting to it

Question

So I want to wait 1 second for some input (options that i will implement later). Or i want the program to print something(will implement later too). I have run into a problem th

Answer 1

I've modified your sample slightly so that it works. There was an error in the read statement. use read varinstead of read $var. This corrected sample will now recognise also the h input.

Related to your question Why it doesn't wait the second (which was btw. hard to determine so i increased the timeout a bit ;-) )? This is because when you enter something, the read timeout is interrupted. It is as the parameter name say's a timeout for the user input. So if the user input's something the timeout is interrupted.

#!/bin/bash

while true 
do
      echo 'wait for input ...'

      read -t 10 var

      echo 'got input ...'

      case $var in
        h)
          echo 'help'
        ;;
      esac
done