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Shell Scripting Prevent setuid root spoofingSpoofing is a technique through which a user tries to grant unauthorized access on a system by pretending to be the root user. This is called setuid root spoofing. To prevent from spoofing you can add -- after #!/bin/bash. It disables further option processing so that shell will not accept any options. 
Look at the above snapshot, any argument after -- are treated as filenames and arguments. An argument of - is equivalent to --.
Next TopicSteps to write and execute a script
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