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/usr/lib/R/site-library/optparse/INDEX is in r-cran-optparse 1.2.0-1.

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The actual contents of the file can be viewed below.

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OptionParser            A function to create an instance of a parser
                        object
make_option             Functions to enable our OptionParser to
                        recognize specific command line options.
optparse-package        Command line option parser
parse_args              Parse command line options.
print_help              Printing an usage message from an OptionParser
                        object