The scripts we have written so far lack a feature common in most computer programs : interactivity, or the capability 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=-5if [[ "$INT" =~ ^-?[0-9]+$ ]]; then      if [ "$INT" -eq 0 ]; then            echo "INT is zero."      else            if [ "$INT" -lt 0 ]; then                  echo "INT is negative."            else                  echo ...

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