Chapter 28. Reading Keyboard Input
The scripts we have written so far lack a feature common to most computer programs—interactivity, the ability of the program to interact with the user. While many programs don’t need to be interactive, some programs benefit from being able to accept input directly from the user. Take, for example, this script from the previous chapter:
#!/bin/bash # test-integer2: evaluate the value of an integer. INT=-5 if [[ "$INT" =˜ ^-?[0-9]+$ ]]; then if [ $INT -eq 0 ]; then echo "INT is zero." else if [ $INT -lt 0 ]; then echo "INT is negative." else echo "INT is positive." fi if [ $((INT % 2)) -eq 0 ]; then echo "INT is even." else echo "INT is odd." fi fi else echo "INT is not an integer." >&2 exit 1 fi
Each time we want ...