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(libc.info)Group Database

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Group Database
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   This section describes how to search and scan the database of
registered groups.  The database itself is kept in the file
`/etc/group' on most systems, but on some systems a special network
service provides access to it.

Group Data Structure

What each group record contains.

Lookup Group

How to look for a particular group.

Scanning All Groups

Scanning the list of all groups.