Linux bash loop pn user input with if

This extends the basic bash loop pattern with a conditional — treating one specific input value differently from the rest. The if [ $input = "D" ] check runs inside the loop, so each iteration can branch independently. Useful for scripts that have special handling for certain arguments.

• Create an empty file with .sh extension

$ touch test.sh

• Use your favourite editor add a method to the file

$ vi test.sh

#!/bin/bash

function loop_on_user_input(){
    for input in ${1} ; do 
        if [ $input = "D" ]; then
           echo "Hello my special one $input"
        else
           echo "Your input is $input"
        fi
    done
}

"$@"

”$@” is what that makes the script file (.sh) be able to call methods

• Make file executable

$ chmod u+x test.sh

• Call method with space separated multiple inputs

$ ./test.sh loop_on_user_input 'A B C D'
Your input is A
Your input is B
Your input is C
Hello my special one D