enscript --version (return code: 0)
GNU Enscript 188.8.131.52 Copyright (C) 1995-2003, 2007, 2008, 2009, 2010 Free Software Foundation, Inc. GNU Enscript comes with NO WARRANTY, to the extent permitted by law. You may redistribute copies of GNU Enscript under the terms of the GNU General Public License, version 3 or, at your option, any later version. For more information about these matters, see the files named COPYING.
enscript help (return code: 0)
enscript: couldn't open input file "help": No such file or directory no output generated