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who(1) [bsd man page]

WHO(1)							      General Commands Manual							    WHO(1)

NAME
who - who is on the system SYNOPSIS
who [ who-file ] [ am I ] DESCRIPTION
Who, without an argument, lists the login name, terminal name, and login time for each current UNIX user. Without an argument, who examines the /var/run/utmp file to obtain its information. If a file is given, that file is examined. Typically the given file will be /usr/adm/wtmp, which contains a record of all the logins since it was created. Then who lists logins, logouts, and crashes since the creation of the wtmp file. Each login is listed with user name, terminal name (with `/dev/' suppressed), and date and time. When an argument is given, logouts produce a similar line without a user name. Reboots produce a line with `x' in the place of the device name, and a fossil time indicative of when the system went down. With two arguments, as in `who am I' (and also `who are you'), who tells who you are logged in as. FILES
/var/run/utmp SEE ALSO
getuid(2), utmp(5) 7th Edition November 27, 1996 WHO(1)

Check Out this Related Man Page

utmp(4) 						     Kernel Interfaces Manual							   utmp(4)

NAME
utmp, wtmp - Login records SYNOPSIS
#include <utmp.h> DESCRIPTION
The utmp file records information about who is currently using the system. The file is a sequence of utmp entries, as defined in struct utmp in the utmp.h file. The utmp structure gives the name of the special file associated with the user's terminal, the user's login name, and the time of the login in the form of time(3). The ut_type field is the type of entry, which can specify several symbolic constant values. The symbolic constants are defined in the utmp.h file. The wtmp file records all logins and logouts. A null user name indicates a logout on the associated terminal. A terminal referenced with a tilde (~) indicates that the system was rebooted at the indicated time. The adjacent pair of entries with terminal names referenced by a vertical bar (|) or a right brace (}) indicate the system-maintained time just before and just after a date command has changed the sys- tem's time frame. The wtmp file is maintained by login(1) and init(8). Neither of these programs creates the file, so, if it is removed, record keeping is turned off. See ac(8) for information on the file. FILES
RELATED INFORMATION
ac(8), init(8), last(8), lastcomm(8), login(1), who(1), wtmpconvert(8). delim off utmp(4)
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