Is there a “standard” format for command line/shell help text?

Question

If not, is there a de facto standard? Basically I\'m writing a command line help text like so:

usage: app_name [opti         


        

Answer 1

I would follow official projects like tar as an example. In my opinion help msg. needs to be simple and descriptive as possible. Examples of use are good too. There is no real need for "standard help".