Printing an usage message from an OptionParser object

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Description

print_help print an usage message from an OptionParser object, usually called by parse_args when it encounters a help option.

Usage

1
  print_help(object)

Arguments

object

A OptionParser instance.

Value

print_help uses the cat function to print out a usage message. It returns invisible(NULL).

Author(s)

Trevor Davis.

References

Python's optparse library, which inspired this package, is described here: http://docs.python.org/library/optparse.html

See Also

{parse_args} {OptionParser}