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Predicate help/1
Availability::- use_module(library(help)).(can be autoloaded)
Source[det]help
[det]help(+What)
Show help for What. What is a term that describes the topics(s) to give help for. Notations for What are:
Atom
This ambiguous form is most commonly used and shows all matching documents. For example: 
?- help(append).
Name / Arity
Give help on predicates with matching Name/Arity. Arity may be unbound.
Name // Arity
Give help on the matching DCG rule (non-terminal)
Module:Name
Give help on predicates with Name in Module and any arity. Used for loaded code only.
Module:Name/Arity
Give help on predicates with Name in Module and Arity. Used for loaded code only.
f(Name/Arity)
Give help on the matching Prolog arithmetic functions.
c(Name)
Give help on the matching C interface function
section(Label)
Show the section from the manual with matching Label.

help/1 shows documentation from the manual as well as from loaded user code if the code is documented using PlDoc. To show only the documentatoion of the loaded predicate we may prefix predicate indicator with the module in which it is defined.

If an exact match fails this predicates attempts fuzzy matching and, when successful, display the results headed by a warning that the matches are based on fuzzy matching.

If possible, the results are sent through a pager such as the less program. This behaviour is controlled by the Prolog flag help_pager. See section level documentation.

See also
apropos/1 for searching the manual names and summaries.
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LogicalCaptain said (2021-02-27T11:12:11):0 upvotes 0 0 downvotes
Picture of user LogicalCaptain.

This should probably ALSO accept a predicate call as in

help(file_base_name(Base,"/foo/bar/baz.gz")).

Because wrapping "help" around a failed call without editing it further would be a common thing to do.