How to check if running as root in a bash script -

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i'm writing script requires root level permissions, , want make if script not run root, echoes "please run root." , exits.

here's pseudocode i'm looking for:

if (whoami != root)   echo "please run root"    else (do stuff) fi  exit

how best (cleanly , securely) accomplish this? thanks!

ah, clarify: (do stuff) part involve running commands in-and-of require root. running normal user come error. meant cleanly run script requires root commands, without using sudo inside script, i'm looking syntactic sugar.

the $euid environment variable holds current user's uid. root's uid 0. use in script:

if [ "$euid" -ne 0 ]   echo "please run root"   exit fi

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