Bash Cookbook

Nested if statements

If a single level of if statements is not enough and you would like to have additional logic within an if statement, you can create nested conditional statements. This can be done in the following way:

#!/bin/bashUSER_AGE=18AGE_LIMIT=18NAME="Bob" # Change to your username if you want to execute the nested logicHAS_NIGHTMARES="true"if [ "${USER}" == "${NAME}" ]; then    if [ ${USER_AGE} -ge ${AGE_LIMIT} ]; then        if [ "${HAS_NIGHTMARES}" == "true" ]; then            echo "${USER} gets nightmares, and should not see the movie"        fi    fielse    echo "Who is this?"fi