/usr/lib/s9fes/help/sys_group-name is in scheme9 2010.11.13-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | S9 EXT (sys:group-name string|integer) ==> string
(sys:group-gid string|integer) ==> integer
Return the group name or GID associated with the group name
STRING or the GID INTEGER. (Yes, getting the group name of a
group name or the GID of a GID is an identity operation.)
(sys:group-name 0) ==> "wheel"
(sys:group-gid "wheel") ==> 0
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