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From: byrnejb on 15 Jul 2010 12:22 I am trying, without success obviously, to check for a mandatory argument switch using OptionParser. I have this code: opts.on("-m", "--mapfile=FILE", "Set data mapping file name", " (default) '#{options.mapfile}'") do |file| options.mapfile << file.strip end As far as I can tell, the absence of [] around the argument FILE should make this a required switch. However, when I run the script without any switches at all it does not raise a missing argument error. Why not? Does 'mandatory' refer only to the value supplied to a switch and not to the presence or absence of the switch itself?
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