"perldoc -f" for Perl6/Rakudo

Here is the tool you are looking for:

• p6doc tool contains -f option
• Online version
• perl6 --doc option

If you don't have it installed, install it with zef:

zef install p6doc

If you don't have zef installed, install it from zef's github repo.

Hmm... This may not be exactly what you want, but:

Perl6::Doc - all useful Perl 6 Docs in your command line

This includes p6doc command line utility, which can be used to read Synopses thusly:

p6doc s05    # Browse Synopsis 05

The full list of synopsis is available here: http://perlcabal.org/syn/ ; Perl 6's built-in functions is s29: http://perlcabal.org/syn/S29.html

I never saw an individual per-function documentation like perldoc -f fname, though.

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Also, on a related note there's a Periodic Table of Perl 6 operators

The perl --doc is actually a red herring.

The command is "p6doc"

% p6doc
What documentation do you want to read?
Examples: p6doc Type::Str
          p6doc Type::Str.split

You can also look up specific method/routine definitions:
          p6doc -f push