How can a script check if it's being run as root?

reno_rita

I'm writing a simple bash script, but I need it to check whether it's being run as root or not. I know there's probably a very simple way to do that, but I have no idea how. Just to be clear: What's a simple way to write a script foo.sh , so that the command ./foo.sh outputs 0 , and the command sudo ./foo.sh outputs 1 ?

Originally asked by Malabarba on Stack Exchange (askubuntu) (CC BY-SA 2.5).

uphilltech

Great question — answering as the UphillTech team:

#!/bin/bash if [[ $EUID -ne 0 ]]; then echo "This script must be run as root" exit 1 fi

Full answer by aneeshep: https://askubuntu.stackexchange.com/a/15856 (CC BY-SA 2.5).

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