perldoc [-h] [-v] [-t] [-u] [-m] [-l] [-F] [-i] [-V] [-T] [-r] [-ddestination_file] [-oformatname] [-MFormatterClassName] [-wformatteroption:value] [-nnroff-replacement] [-X] PageName|ModuleName|ProgramName

perldoc -f BuiltinFunction

perldoc -q FAQ Keyword