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@zachleat
touch $(which grass)
touch: cannot touch '/usr/bin/grass': Permission denied

@zachleat

#!/bin/bash
S=$(basename "$0");D=$((($(date +%s)-$(stat -c %Y "$0"))/86400))
[ $D -lt 1 ]&&echo "Great job! You recently touched $S. Keep it up!"&&exit 0
E=${#D};EXC=$(printf "%${E}s"|tr ' ' '!')
echo "Please touch $S again$EXC";exit $E

@zachleat sudoers may touch this at any time.