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(libc.info)User Database

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User Database
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   This section describes how to search and scan the database of
registered users.  The database itself is kept in the file
`/etc/passwd' on most systems, but on some systems a special network
server gives access to it.

User Data Structure

What each user record contains.

Lookup User

How to look for a particular user.

Scanning All Users

Scanning the list of all users, one by one.

Writing a User Entry

How a program can rewrite a user's record.