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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. |