[PATCH] Provide --help option to display usage of plymouth-set-default-theme

[Adrian Glaubitz]

Hi,

when running new, unfamiliar commands I usually invoke them with
--help to see what options they have. For plymouth-set-default-theme,
there is no --help option which I find a bit confusing, especially
since the usage is not straight-forward. Since there is a usage
function in the script anyway, I wrote a small patch to provide a
--help option to display the usage.

Moreover, I think, the usage output should be overhauled a bit, but I
think that should go into a second patch.


Adrian
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