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a2b2a9c55f
Avoid having /sbin/wifi silently ignore unknown keywords and execute "up"; instead display the help message and exit with an error. Spell out the "up" keyword (which has users), add it to usage output, and preserve the implicit assumption that runing /sbin/wifi without argument performs "up". Signed-off-by: Thibaut VARÈNE <hacks@slashdirt.org> (backported from 78b5764fd8a3c133f0caf170238242b32a97105b)