You can run font generator manually from command line:
./bin/generate_font.sh FONTNAME TMPDIR ZIPBALL
FONTNAME
: generated font filenameTMPDIR
: path whereconfig.json
(with user config) is placedZIPBALL
: output archive with generated font and demo
If you are debugging font merger or builder, you might want to generate generator config manually on base of user config (you can get it from the generated zipball):
./fontello.js font_config --input config.json --output builder-config.json