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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