#!/bin/bash

IAM=$(whoami)
ID=$(id -u $IAM)
echo "${IAM}"
echo "${ID}"


Andromeda $ ls -al | grep test.sh
-rwsrwxrwx  1 pkaramol pkaramol        71 Δεκ   8 07:52 test.sh

Andromeda $ ./test.sh
pkaramol
1000

Andromeda $ su testuser
Password:
testuser@Andromeda:/home/pkaramol/Desktop$ ./test.sh
testuser
1001