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Perl in a Nutshell

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Function Reference
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getgrgid gid

Retrieves a group file (/etc/group) entry by group number gid. The return value in list context is:

($name, $passwd, $gid, $members)
where $members contains a space-separated list of the login names of the members of the group. If you want to do this repeatedly, consider caching the data in a hash using getgrent. In scalar context, getgrgid returns only the group name.

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