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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.
29.13.1 The Data Structure that Describes a User What each user record contains. 29.13.2 Looking Up One User How to look for a particular user. 29.13.3 Scanning the List of All Users Scanning the list of all users, one by one. 29.13.4 Writing a User Entry How a program can rewrite a user's record.
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