====== BASH - Check Whether You’re Root ======

<code bash>
#!/bin/bash
ROOT_UID=0

if [ "$UID" -eq "$ROOT_UID" ]
then
echo "You are root."
else
echo "You are not root"
fi
exit 0
</code>

The output of this script depends on the user running it.

It will match the root user based on the $UID.