opl2ofm --version (return code: 0)
opl2ofm 2.1 (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 opl2ofm copyright and the Lesser GNU General Public License. For more information about these matters, see the file named COPYING and the opl2ofm source. Primary author of opl2ofm: J. Plaice, Y. Haralambous, D.E. Knuth.
opl2ofm --help (return code: 0)
Usage: opl2ofm [OPTION]... OPLFILE[.opl] [OFMFILE[.ofm]] Translate the property list OPLFILE to OFMFILE. Default OFMFILE is basename of OPLFILE extended with `.ofm'. -help display this help and exit -verbose display progress reports -version output version information and exit Email bug reports to email@example.com.