Cave survey software
Survex is a suite of programs for processing, viewing, and printing cave survey data.
The individual programs each have a man page, and there's also a comprehensive manual, available in HTML, PDF, and plain text formats. The manual is located in /usr/share/doc/survex and can also be found online at http://survex.com/docs.html
These programs follow the usual GNU command line syntax, with long options starting with two dashes (`--'). All commands support the options described below; for a complete description of options for a command, see its man page or the manual.
Show summary of options.
Output version information and exit.
The Survex Manual (located in /usr/share/doc/survex), 3dtopos(1), aven(1), cad3d(1), cavern(1), diffpos(1), extend(1), sorterr(1), print.ini(5).