gftopk --version (return code: 0)
GFtoPK 2.4 (TeX Live 2015/Debian) kpathsea version 6.2.1 There is NO warranty. Redistribution of this software is covered by the terms of both the GFtoPK copyright and the Lesser GNU General Public License. For more information about these matters, see the file named COPYING and the GFtoPK source. Primary author of GFtoPK: Tomas Rokicki.
gftopk --help (return code: 0)
Usage: gftopk [OPTION]... GFNAME [PKFILE] Translate the bitmap font GFNAME to PKFILE. Default PKFILE is basename of GFNAME extended with `pk'. -help display this help and exit -verbose display progress reports -version output version information and exit Email bug reports to email@example.com.