Process Control keywords in the shell

If...else

if [$1x = = "AB" x]; Then    echo ' You had enter AB ' elif [$1x = = ' CD ' x]; then    echo ' You had enter CD ' Else    echo ' You had enter UNEXPE CTED word "fi

　　

Case...esac

A switch case similar to another language, however, here is a cases clause that can match a variety of situations, with a separate line behind each of these clause clauses ";"

#!/bin/bashwhile:d o    echo-n "Enter a number from 1 to 5:"    read Anum case    $aNum in        1|2|3|4|5) echo "The number you entered is $aNum!"        ;;        *) echo "The number you entered is not between 1 and 5!"            Continue            echo "Game Over"        ;;    Esacdone

　　

Process Control keywords in the shell