How do I determine if a shell script is running with root permissions?

bash/sh:

#!/usr/bin/env bash# (Use #!/bin/sh for sh)if [ `id -u` = 0 ] ; then        echo "I AM ROOT, HEAR ME ROAR"fi

csh:

#!/bin/cshif ( `id -u` == "0" ) then        echo "I AM ROOT, HEAR ME ROAR"endif

shell permissions sudo

You might add something like that at the beginning of your script:

#!/bin/shROOTUID="0"if [ "$(id -u)" -ne "$ROOTUID" ] ; then    echo "This script must be executed with root privileges."    exit 1fi

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