Many bash scripts use arguments to control the commands that they will run and the information that will be provided to the people running them. This post examines a number of ways that you can verify arguments when you prepare a script and want to make sure that it will do just what you intend it to do – even when someone running it makes a mistake.
Displaying the script name, etc.
To display the name of a script when it’s run, use a command like echo $0. While anyone running a script will undoubtedly know what script they just invoked, using the script name in a usage command can help remind them what command and arguments they should be providing.
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Source:: Network World – Data Center