identifying SU mode by shell script

Linux and Unix-Like Red Hat
1

the following bash script is not working in fedora-11 Could anyone help me please?

#!/bin/bash

if
[$[`id -u`] -ne  0];then
       echo " you are in root"
else   echo " you must be in root -su mode??"
fi
exit
2

Replace:

if [$[`id -u`] -ne  0]

with:

if [ $(id -u) -ne 0 ]

Be aware of the spaces around the square brackets.

3

Thanks Franklin very much..........