.TH WHO 1 .SH NAMEwho  \-  who is on the system.SH SYNOPSIS.B who[ who-file ] [.B "am I"].SH DESCRIPTION.I Who,without an argument,lists the login name, terminal name, and login timefor each current UNIX user..PPWithout an argument,.I whoexamines the /etc/utmpfile 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 itwas created.Then.I wholistslogins, logouts, and crashes since the creation ofthe 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..PPWith two arguments,as in `who am I' (and also `who are you'),.I whotells who you are logged in as..SH FILES/etc/utmp.SH "SEE ALSO"getuid(2), utmp(5)