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The GetoptLong class allows you to parse command line options similarly to the
GNU getopt_long() C library call. Note, however, that GetoptLong is a pure Ruby
implementation.
GetoptLong allows for POSIX-style options like --file as well as single letter
options like -f
The empty option -- (two minus symbols) is used to end option processing. This
can be particularly important if options have optional arguments.
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