(libc.info.gz) User Accounting Database

 
 29.12 The User Accounting Database
 ==================================
 
 Most Unix-like operating systems keep track of logged in users by
 maintaining a user accounting database.  This user accounting database
 stores for each terminal, who has logged on, at what time, the process
 ID of the user's login shell, etc., etc., but also stores information
 about the run level of the system, the time of the last system reboot,
 and possibly more.
 
    The user accounting database typically lives in `/etc/utmp',
 `/var/adm/utmp' or `/var/run/utmp'.  However, these files should
 *never* be accessed directly.  For reading information from and writing
 information to the user accounting database, the functions described in
 this section should be used.

 
* Manipulating the Database   Scanning and modifying the user
                                  accounting database.
* XPG Functions               A standardized way for doing the same thing.
* Logging In and Out          Functions from BSD that modify the user
                                  accounting database.

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