method
add_option
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Class: Command
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add_option(*opts)
public
Add a command-line option and handler to the command.
See OptionParser#make_switch for an explanation of opts.
handler will be called with two values, the value of the argument and the options hash.
If the first argument of add_option is a Symbol, it’s used to group options in output. See `gem help list` for an example.