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.|