otangle --version (return code: 0)
OTANGLE 4.4 (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 OTANGLE copyright and the Lesser GNU General Public License. For more information about these matters, see the file named COPYING and the OTANGLE source. Primary author of OTANGLE: J. Plaice, Y. Haralambous, D.E. Knuth.
otangle --help (return code: 0)
Usage: otangle [OPTION]... WEBFILE[.web] [CHANGEFILE[.ch]] Tangle WEBFILE with CHANGEFILE into a Pascal program. Default CHANGEFILE is /dev/null; Pascal output goes to the basename of WEBFILE extended with `.p', and a string pool file, if necessary, to the same extended with `.pool'. -help display this help and exit -version output version information and exit Email bug reports to email@example.com.