denemo --version (return code: 0)
Unable to init server: Could not connect: Connection refused [0;32mDenemo - MESSAGE [0m: Could not start graphical interface. GNU Denemo version 2.2.0 Gtk versions runtime: 3.22.21, compiled against: 3.22.17, ? 1999-2005, 2009 Matthew Hiller, Adam Tee, and others, 2010-2015 Richard Shann, Jeremiah Benham, Nils Gey and others. This program is provided with absolutely NO WARRANTY; see the file COPYING for details. This software may be redistributed and modified under the terms of the GNU General Public License; again, see the file COPYING for details.
denemo -h (return code: 0)
Unable to init server: Could not connect: Connection refused [0;32mDenemo - MESSAGE [0m: Could not start graphical interface. Usage: denemo [OPTION?] [FILE]... GNU Denemo version 2.2.0 Denemo is a graphical music notation editor. It uses GNU Lilypond for music typesetting. Denemo is part of the GNU project. Help Options: -h, --help Show help options Application Options: -i, --scheme-path=path Process scheme commands in pathtofile on file open -s, --scheme-script-name=file Process scheme commands from system file on file open -a, --scheme=scheme Process the scheme on startup -e, --fatal-scheme-errors Abort on scheme errors -m, --silent Don't log any message -V, --verbose Display every messages -n, --non-interactive Launch Denemo without GUI -v, --version Print version information and exit Report bugs to http://www.denemo.org GNU Denemo, a free and open music notation editor