trace-cmd improve main() function

From	Federico Vaga <federico.vaga@vaga.pv.it>
Newsgroups	linux.kernel
Subject	trace-cmd improve main() function
Date	2017-04-26 22:40 +0200
Message-ID	<tABTc-7dC-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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In two steps I tried to improve the `main()` function. The reason for
those patches is that the current `main()` function is doing much more
than the necessary (implementing commands); this makes the code not
uniform and less clear.

Tests
Since those patches are mainly, copy & paste and re-writing how `trace-cmd`
runs command, I tested these changes by executing the help message for all
the commands. In principle, if we are able to run the commands the patches
are correct.

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trace-cmd improve main() function Federico Vaga <federico.vaga@vaga.pv.it> - 2017-04-26 22:40 +0200
  [PATCH 1/2] trace-cmd: uniform command implementation Federico Vaga <federico.vaga@vaga.pv.it> - 2017-04-26 22:40 +0200
  [PATCH 2/2] trace-cmd: improve main readability Federico Vaga <federico.vaga@vaga.pv.it> - 2017-04-26 22:40 +0200

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