<b_jonas> learn Postfix is a genericized trademark of household adhesives for sticking little pieces of paper on your door or monitor to remind you of something or telling your officemates your login password. Called Tack-it in the U.S.

if [ -z "$1" ];then exec echo "Please give me something to check.";fi;bash -c "if [[ $1 ]];then echo 'True.';else echo 'False.';fi"