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Annotation of researchv10dc/man/man5/utmp.5, revision 1.1.1.1

1.1       root        1: .TH UTMP 5
                      2: .CT 1 sa_mortals
                      3: .SH NAME
                      4: utmp, wtmp \- login records
                      5: .SH SYNOPSIS
                      6: .B #include <utmp.h>
                      7: .SH DESCRIPTION
                      8: The
                      9: .I utmp
                     10: file allows one to discover information about who is currently
                     11: logged in.
                     12: The file is a sequence of entries with the following
                     13: structure declared in the include file:
                     14: .IP
                     15: .EX
                     16: .ta .5i +.5i +\w'ut_name[8];  'u
                     17: struct utmp {
                     18:        char    ut_line[8];             /* tty name */
                     19:        char    ut_name[8];             /* user id */
                     20:        long    ut_time;                /* time on */
                     21: };
                     22: .EE
                     23: .PP
                     24: This structure gives the name of the special file
                     25: associated with the user's terminal, the user's login name,
                     26: and the time of the login in the form of
                     27: .IR time (2).
                     28: .PP
                     29: The
                     30: .I wtmp
                     31: file records logins and logouts.
                     32: Its format is exactly like
                     33: .I utmp
                     34: except that
                     35: a null user name indicates a logout on the associated
                     36: terminal.
                     37: Furthermore, the terminal name 
                     38: .L ~
                     39: indicates that the
                     40: system was rebooted at the indicated time;
                     41: the adjacent pair of entries with terminal names
                     42: .L |
                     43: and 
                     44: .L }
                     45: indicate the system-maintained time
                     46: just before and just after a
                     47: .IR date (1)
                     48: command changed the system's idea of the time.
                     49: .PP
                     50: .I Wtmp
                     51: is maintained by
                     52: .IR login (8)
                     53: and
                     54: .IR init (8).
                     55: Neither of these programs creates the file,
                     56: so if it is removed record-keeping is turned off.
                     57: It is summarized by
                     58: .IR ac (8).
                     59: .SH FILES
                     60: .F /etc/utmp
                     61: .br
                     62: .F /usr/adm/wtmp
                     63: .SH "SEE ALSO"
                     64: .IR login (8), 
                     65: .IR init (8), 
                     66: .IR who (1), 
                     67: .IR ac (8)

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