The Apache Commons CLI library provides an API for parsing command line options
 passed to programs. It's also able to print help messages detailing the options
 available for a command line tool.
 .
 Commons CLI supports different types of options:
 .
  * POSIX like options (ie. tar -zxvf foo.tar.gz)
  * GNU like long options (ie. du --human-readable --max-depth=1)
  * Java like properties (ie. java -Djava.awt.headless=true Foo)
  * Short options with value attached (ie. gcc -O2 foo.c)
  * long options with single hyphen (ie. ant -projecthelp)