linux-kernel - trace-cmd improve main() function

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Message-Id: <20170426203028.13900-1-federico.vaga@vaga.pv.it>
Date:   Wed, 26 Apr 2017 22:30:26 +0200
From:   Federico Vaga <federico.vaga@...a.pv.it>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: trace-cmd improve main() function

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.