--help
section
Print a help message. The section argument can be one of
simple, list, output, threads, misc, or all. The argument
can be shortened to one of the underlined letters as in:
s|l|o|t|m|a.
--info
Print debugging info.
L
List all format specifiers.
V
Print the procps-ng version.
-V
Print the procps-ng version.
--version
Print the procps-ng version.