GNU Octave, version 4.2.1 Copyright (C) 2017 John W. Eaton and others. This is free software; see the source code for copying conditions. There is ABSOLUTELY NO WARRANTY; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Octave was configured for "x86_64-pc-linux-gnu". Additional information about Octave is available at http://www.octave.org. Please contribute if you find this software useful. For more information, visit http://www.octave.org/get-involved.html Read http://www.octave.org/bugs.html to learn how to submit bug reports.

octave-cli: unrecognized option '--HELP' usage: octave [-HVWdfhiqvx] [--debug] [--debug-jit] [--doc-cache-file file] [--echo-commands] [--eval CODE] [--exec-path path] [--force-gui] [--help] [--image-path path] [--info-file file] [--info-program prog] [--interactive] [--jit-compiler] [--line-editing] [--no-gui] [--no-history] [--no-init-file] [--no-init-path] [--no-line-editing] [--no-site-file] [--no-window-system] [--norc] [-p path] [--path path] [--persist] [--silent] [--traditional] [--verbose] [--version] [file]