login(1)

NAME
     login - log into the computer

SYNOPSIS
     login [user]

EXAMPLES

     login ast           # Login as ast

DESCRIPTION

     Login allows a logged in user to login  as  someone  else  without  first
     logging out.  If a password is needed, login will prompt for it.

SEE ALSO
     su(1), init(8), getty(8), rlogin(1).