tar and ps support writing parameters without leading dashes

Describe the bug
With tar (and ps and other tools as well), e.g.tar -xp is synonymous to tar xp. Right now, for both tar and ps, kmdr currently only recognizes the tar -xp form of the command properly. Otherwise, it will tell you things like xp -- an operand.

To Reproduce

1. kmdr explain
2. tar xp

Expected behavior
Treat dash-prefixed parameters the same as unprefixed ones for these kinds of commands.

Desktop (please complete the following information):

• OS: Linux
• Browser: no
• Version: no

[ediardo]

Hi @sknorr , thanks for the issue 👍

The parser would need to handle a special case for programs that accept BSD-like options. I'll focus on ps and tar, are there more?