projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 8a6242e1 | 1 | .\" @(#)who.1 6.1 (Berkeley) %G% |
| abab0fe1 | 2 | .\" |
| 8a6242e1 | 3 | .TH WHO 1 "" |
| abab0fe1 KM |
4 | .AT 3 |
| 5 | .SH NAME | |
| 6 | who \- who is on the system | |
| 7 | .SH SYNOPSIS | |
| 8 | .B who | |
| 9 | [ who-file ] [ | |
| 10 | .B "am I" | |
| 11 | ] | |
| 12 | .SH DESCRIPTION | |
| 13 | .I Who, | |
| 14 | without an argument, | |
| 15 | lists the login name, terminal name, and login time | |
| 16 | for each current UNIX user. | |
| 17 | .PP | |
| 18 | Without an argument, | |
| 19 | .I who | |
| 35f1b24f KM |
20 | examines the |
| 21 | .I /etc/utmp | |
| abab0fe1 KM |
22 | file to obtain its information. |
| 23 | If a file is given, that file is examined. | |
| 24 | Typically the given file will be /usr/adm/wtmp, | |
| 25 | which contains a record of all the logins since it | |
| 26 | was created. | |
| 27 | Then | |
| 28 | .I who | |
| 29 | lists | |
| 30 | logins, logouts, and crashes since the creation of | |
| 31 | the wtmp file. | |
| 32 | Each login is listed with user name, | |
| 33 | terminal name (with `/dev/' | |
| 34 | suppressed), | |
| 35 | and date and time. | |
| 36 | When an argument is given, logouts produce a similar line without a user name. | |
| 37 | Reboots produce a line with `x' in the place of the device name, | |
| 38 | and a fossil time indicative of when the system went down. | |
| 39 | .PP | |
| 40 | With two arguments, | |
| 41 | as in `who am I' (and also `who are you'), | |
| 42 | .I who | |
| 43 | tells who you are logged in as. | |
| 44 | .SH FILES | |
| 45 | /etc/utmp | |
| 46 | .SH "SEE ALSO" | |
| 47 | getuid(2), utmp(5) |