Display help about opam and opam commands.
opam help [OPTION]... [TOPIC]
Prints help about OPAM commands.
Use `opam help topics' to get the full list of help topics.
TOPIC
The topic to get help on.
--help[=FMT] (default=pager)
Show this help in format FMT (pager, plain or groff).
--man-format=FMT (absent=pager)
Show output in format FMT (pager, plain or groff).
--version
Show version information.