pre-grohtml --version (return code: 0)
GNU pre-grohtml (groff) version 1.22.3
pre-grohtml --help (return code: 0)
This program is not intended to be called stand-alone; it is part of the groff pipeline to produce HTML output. If there is ever the need to call it manually (e.g., for debugging purposes), add command line option `-V' while calling the `groff' program to see which arguments are passed to it.