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There's no need to $(cat .../uevent | grep DEVTYPE) and then compare it
to what we're looking for. grep can do all of it for us ("Useless Use of
Cat").
While at it, if we have three ways of checking whether a device is
wireless, let's order them from least expensive (checking dir is only
one stat()) to most expensive (iwconfig | grep). Proof of correctness:
if "iwconfig | grep" is returning true and the other two methods are
not, we will still reach "iwconfig | grep" in the series of if/elif.
Signed-off-by: Jakub Jankowski <shasta@toxcorp.com>
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