This manual page is not meant to be exhaustive. The complete documentation for this version of TEX can be found in the info file or manual Web2C: A TeX implementation.
The dvitype program translates a DVI (!DeVice? Independent) file output by (for example) tex(1) or gftodvi(1), to a file that humans can read. It also serves as a DVI file-validating program (i.e., if dvitype can read it, it's correct) and as an example of a DVI-reading program for future device drivers.
The output file can include all commands, just the important ones, or none at all (in which case only errors are reported). A subinterval of pages may be selected for transliteration; the magnification and resolution of the ``output device'' may be changed; and so on. All options are specified with an on-line dialog.