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My bash version is:

$ bash --version
GNU bash, version 3.00.16(1)-release (sparc-sun-solaris2.10)
Copyright (C) 2004 Free Software Foundation, Inc.

here is a small script I wrote:

#! /bin/bash

if [[ $# == 0 ]]
then
echo "argument is null"
fi

It is giving error:
test.sh: [[: not found

any idea, why is it so?