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           xhost [[+-]name ...]


           The xhost program is used to add and delete host names or user names to
           the list allowed to make connections to the X server.  In the  case  of
           hosts,  this  provides  a rudimentary form of privacy control and secu-
           rity.  It is only sufficient for a workstation (single  user)  environ-
           ment,  although  it  does  limit  the worst abuses.  Environments which
           require more sophisticated measures  should  implement  the  user-based
           mechanism  or use the hooks in the protocol for passing other authenti-
           cation data to the server.


           Xhost accepts the following command line options described below.   For
           security,  the  options that affect access control may only be run from
           the "controlling host".  For workstations, this is the same machine  as
           the server.  For X terminals, it is the login host.
           -help   Prints a usage message.
           [+]name The given name (the plus sign is optional) is added to the list
                   allowed to connect to the X server.  The name  can  be  a  host
                   name or a user name.
           -name   The  given  name is removed from the list of allowed to connect
                   to the server.  The name can be a host name  or  a  user  name.
                   Existing   connections  are  not  broken,  but  new  connection
                   attempts will be denied.  Note  that  the  current  machine  is
                   allowed  to be removed; however, further connections (including
                   attempts to add it back) will not be permitted.  Resetting  the
                   server  (thereby  breaking  all connections) is the only way to
                   allow local connections again.
           +       Access is granted to everyone, even if they aren't on the  list
                   (i.e., access control is turned off).
           -       Access  is  restricted  to only those on the list (i.e., access
                   control is turned on).
           nothing If no command line arguments are given,  a  message  indicating
                   whether  or not access control is currently enabled is printed,
                   followed by the list of those allowed to connect.  This is  the
                   only  option that may be used from machines other than the con-
                   trolling host.


           A complete name has the syntax ''family:name'' where the  families  are
           as follows:
           inet      Internet host (IPv4)
           inet6     Internet host (IPv6)
           For backward compatibility with pre-R6 xhost, names that contain an at-
           sign (@) are assumed to be in  the  nis  family.   Otherwise  they  are
           assumed to be Internet addresses. If compiled to support IPv6, then all
           IPv4 and IPv6 addresses returned by getaddrinfo(3)  are  added  to  the
           access list in the appropriate inet or inet6 family.
           Server interpreted addresses consist of a case-sensitive type tag and a
           string representing a given value, separated by a colon.  For  example,
           "si:hostname:almas"  is  a server interpreted address of type hostname,
           with a value of almas.   For more information on the available forms of
           server interpreted addresses, see the Xsecurity(7) manual page.
           The  initial access control list for display number n may be set by the
           file /etc/Xn.hosts, where n is the display number of the  server.   See
           Xserver(1) for details.


           For  each  name  added  to  the access control list, a line of the form
           "name being added to access control list" is printed.   For  each  name
           removed  from  the  access control list, a line of the form "name being
           removed from access control list" is printed.


           X(7), Xsecurity(7), Xserver(1), xdm(1), xauth(1), getaddrinfo(3)


           DISPLAY to get the default host and display to use.


           You can't specify a display on the command line because -display  is  a
           valid  command  line  argument  (indicating that you want to remove the
           machine named ''display'' from the access list).
           The X server stores network addresses, not host names, unless  you  use
           the  server-interpreted hostname type address.  If somehow you change a
           host's network address while the server is still running, and  you  are
           using  a  network-address  based  form of authentication, xhost must be
           used to add the new address and/or remove the old address.


           Bob Scheifler, MIT Laboratory for Computer Science,
           Jim Gettys, MIT Project Athena (DEC).

    X Version 11 xhost 1.0.4 XHOST(1)


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