4.4BSD/usr/share/man/cat1/who.0

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WHO(1)                       BSD Reference Manual                       WHO(1)

NNAAMMEE
     wwhhoo - display who is logged in

SSYYNNOOPPSSIISS
     wwhhoo [_a_m _I] [_f_i_l_e]

DDEESSCCRRIIPPTTIIOONN
     The utility wwhhoo displays a list of all users currently logged on, showing
     for each user the login name, tty name, the date and time of login, and
     hostname if not local.

     Available options:

     _a_m _I  Returns the invoker's real user name.

     _f_i_l_e  By default, wwhhoo gathers information from the file _/_v_a_r_/_r_u_n_/_u_t_m_p. An
           alternate _f_i_l_e may be specified which is usually _/_v_a_r_/_r_u_n_/_w_t_m_p (or
           _/_v_a_r_/_r_u_n_/_w_t_m_p_._[_0_-_6_] depending on site policy as _w_t_m_p can grow quite
           large and daily versions may or may not kept around after compres-
           sion by ac(8)).  The _w_t_m_p file contains a record of every login,
           logout, crash, shutdown and date change since _w_t_m_p was last trun-
           cated or created.

     If _/_v_a_r_/_l_o_g_/_w_t_m_p is being used as the file, the user name may be empty or
     one of the special characters '|', '}' and '~'.  Logouts produce an out-
     put line without any user name.  For more information on the special
     characters, see utmp(5).

FFIILLEESS
     /var/run/utmp
     /var/log/wtmp
     /var/log/wtmp.[0-6]

SSEEEE AALLSSOO
     last(1),  users(1),  getuid(2),  utmp(5)

HHIISSTTOORRYY
     A wwhhoo command appeared in Version 6 AT&T UNIX.

4.4BSD                           June 6, 1993                                1