Bash scripts requiring sudo password

To get the password, just put sudo echo "Thanks." at the start of the script.

But I would prefer this solution:

if [[ $UID != 0 ]]; then    echo "Please run this script with sudo:"    echo "sudo $0 $*"    exit 1fi

For those who don't want to elevate the entire script (to limit risks by only using sudo within the script where needed) the first part of the accepted answer sudo echo "Thanks" works but won't respond to sudo password failure by exiting the script. To accomplish this, scripts that include sudo commands and want to ensure sudo access before it's used could start with

if [[ ! $(sudo echo 0) ]]; then exit; fi

The caveat is that you are relying on the existence of a sudoers timeout that will last the duration of your script to suppress the rest of the prompts.

Another way to go about it :

function checkSudo() {    if ((EUID != 0)); then        echo "Granting root privileges for script ( $SCRIPT_NAME )"        if [[ -t 1 ]]; then            sudo "$0" "$@"        else            exec 1>output_file            gksu "$0" "$@"        fi        exit    fi}