Re: extcap command line parameter format

[Guy Harris <guy () alum mit edu>]

Oh, and another thing not to do:

        Don't repurpose a command-line flag intended for one purpose for another unrelated purpose.

For example, don't repurpose a command-line flag (for concreteness, let's pick the hypothetical example of a flag 
called "--extcap-version"), intended for one purpose (in this hypothetical example, used to ask a program to report its 
version number), for a separate purpose (in this hypothetical example, used to tell a program the version number of the 
program running that other program), with the two unrelated meanings distinguished based on whether the flag has an 
argument or not.

I.e., for Wireshark 3.0, let's do the latter function with --extcap-wireshark-version X.Y or 
--extcap-wireshark-version=X.Y, with --extcap-version *never* taking an argument and *always* meaning "report your 
version number" and with --extcap-wireshark-version *always* taking an argument and *always* meaning "here's the 
version of Wireshark that's running you".
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