Provided by: zephyr-clients_3.1.2-1build2_amd64 
NAME
zctl - zephyr control program
SYNOPSIS
zctl [ options ]
DESCRIPTION
Zctl is a general purpose control program for the Zephyr(1) Notification Service. It allows the user to
subscribe to specific notice types, to save the subscriptions in a file (default $HOME/.zephyr.subs), to
change his location information, and to send control messages to the HostManager, zhm(8), and the
WindowGram client, zwgc(1).
The commands may be typed on the command line, or may be entered interactively by just typing zctl and
then typing commands to the prompt.
NOTE: For all commands accepting an optional recipient argument, the recipient defaults to your Kerberos
principal. You may also subscribe to recipient ``*''. If you specify a recipient, it is silently
converted to ``*''.
The commands are as follows:
add class instance [ recipient ]
Subscribe to class, instance, recipient, and add this triplet to the subscriptions file.
add_unsubscription class instance [ recipient ]
Unsubscribe to class, instance, recipient, and add this triplet to the subscriptions file
as an un-subscription. For an explanation of un-subscriptions, see below.
cancel Cancel all subscriptions.
defaults Retrieve the default subscription list from the Zephyr server.
delete class instance [ recipient ]
Unsubscribe to class, instance, recipient, and remove this triplet from the subscriptions
file.
delete_unsubscription class instance [ recipient ]
Unsubscribe to class, instance, recipient, and remove this triplet from the subscriptions
file as an un-subscription.
file [ file ] Set default subscriptions file to file. If file isn't specified, show what the current
subscriptions file is.
flush_locs [ user ]
Tell the Zephyr servers to flush all location information associated with user, or with
the user running the command if none is given. This should only be used to remove any
incorrect data that may have been left after a system crash. Note that only Operations
staff may flush location information associated with another user.
flush_subs [ recipient ]
Tell the Zephyr servers to flush all of recipient's subscriptions, This differs from the
cancel command in that it affects subscriptions for all of recipient's clients. Note that
only Operations staff may flush the subscriptions of another user.
hide Hide your location as maintained by the Zephyr server. This does not affect the value of
the exposure variable (see below, under set).
hm_flush Tell the HostManager, zhm(8), to ask the server to flush all state associated with the
current host.
list [ file ] List contents of current subscriptions file or file. Any macros in the file (see below)
are displayed verbatim and not expanded.
list_requests List all available commands. May be abbreviated by '?'.
load [ file ] Subscribe to all subscription triplets and unsubscribe to all un-subscription triplets in
current subscriptions file or file.
new_server Tell the HostManager, zhm(8), to find a new Zephyr server.
quit Exit from zctl.
retrieve Retrieve all current subscriptions from the Zephyr server. These include subscriptions
that might have been made by other programs, such as znol(1).
save [ file ] Save all current subscriptions (as returned by the Zephyr server) into current
subscriptions file or file. The file will be replaced.
set var [ value ]
Set the value of Zephyr variable var to value, or null if no value is specified. The
variable exposure has special significance, and can only be set to the values none,
opstaff, realm-visible, realm-announced, net-visible, and net-announced. Setting this
variable immediately updates the information in the Zephyr servers (see below for an
explanation of the exposure levels). In addition, setting this variable to none
automatically performs the equivalent of a wg_shutdown command, and setting it to one of
the other values automatically performs the equivalent of a wg_startup command.
The variable resolved_addresses determines whether zwgc will, for an IP address indicating
the origin of a message, attempt to look up the hostname corresponding to that IP address.
The value none indicates that hostnames will never be found, and that the zwgc fromhost
variable will thus always contain an IP address (in dotted-decimal form). The value all
indicates that there will always be an attempt to look up a hostname. Note that in this
case, if you have any subscriptions with recipient ``*'', these subscriptions may be
revealed to other Zephyr users who operate their own DNS name servers. Any other value is
interpreted as a regular expression; hostname lookup attempts will occur only if the IP
address matches this regular expression.
Any variable settings you make will be stored in $HOME/.zephyr.vars
show var [ var ... ]
Show the value of the specified Zephyr variables. If a variable is not defined in the
user's own variables file, the system variables file (/etc/zephyr/zephyr.vars) is searched
for a default value.
subscribe class instance [ recipient ]
Subscribe to class, instance, recipient, but don't add this triplet to the subscriptions
file.
unhide Make your location as maintained by the Zephyr server visible. This does not affect the
value of the exposure variable.
unload [ file ]
Unsubscribe to all subscription triplets in current subscriptions file or file. Un-
subscriptions in the file are ignored.
unset var [ var ... ]
Delete the definitions of the specified Zephyr variables.
unsubscribe class instance [ recipient ]
Unsubscribe to class, instance, recipient, but don't remove this triplet from the
subscriptions file.
wg_exit Tell the WindowGram client, zwgc(1), to exit.
wg_read Tell the WindowGram client, zwgc(1), to reread its description file.
wg_shutdown Tell the WindowGram client to shutdown; this causes it to ignore all notices until a
wg_startup command is issued.
wg_startup Tell the WindowGram client to start accepting notices again; useful after a wg_shutdown
command has been issued.
MACROS and SUBSCRIPTION FILES
There are three macros, %host%, %canon%, and %me%. %host% is converted to the current hostname, %canon%
is converted to the official hostname as returned by gethostbyname(3), and %me% is converted to your
Kerberos principal. These macros can be used in your $HOME/.zephyr.subs file or as arguments to commands
to specify the class or instance fields. A sample $HOME/.zephyr.subs file might contain the following:
message,urgent,%me%
syslog,%host%,*
mail,pop,%me%
Zctl reads the environment variable WGFILE, to find the name of the file where the windowgram port
resides. If WGFILE is not set, the file name defaults to /tmp/wg.uid, where uid is the user's UNIX uid.
UN-SUBSCRIPTIONS
The zephyr server, zephyrd(8), maintains default subscriptions which are automatically added to all
users' subscriptions at the time of their first subscription during a login session. If you wish to
automatically remove some of these default subscriptions, you use un-subscriptions. When you load a
subscription file containing un-subscriptions, the un-subscriptions are automatically sent to the server
as if you had used the unsubscribe command.
EXPOSURE LEVELS
The different exposure levels affect the operation of zephyr and its interaction with the user, as
follows:
none This completely disables Zephyr for the user. The user is not registered with Zephyr. No user
location information is retained by Zephyr. No login or logout announcements will be sent. No
subscriptions will be entered for the user, and no notices will be displayed by zwgc(1).
opstaff The user is registered with Zephyr. No login or logout announcements will be sent, and
location information will only be visible to Operations staff. Default subscriptions and any
additional personal subscriptions will be entered for the user.
realm-visible
The user is registered with Zephyr. User location information is retained by Zephyr and made
available only to users within the user's Kerberos realm. No login or logout announcements
will be sent. This is the system default. Default subscriptions and any additional personal
subscriptions will be entered for the user.
realm-announced
The user is registered with Zephyr. User location information is retained by Zephyr and made
available only to users authenticated within the user's Kerberos realm. Login and logout
announcements will be sent, but only to users within the user's Kerberos realm who have
explicitly requested such via subscriptions. Default subscriptions and any additional personal
subscriptions will be entered for the user.
net-visible
The user is registered with Zephyr. User location information is retained by Zephyr and made
available to any authenticated user who requests such. Login and logout announcements will be
sent only to users within the user's Kerberos realm who have explicitly requested such via
subscriptions. Default subscriptions and any additional personal subscriptions will be entered
for the user.
net-announced
The user is registered with Zephyr. User location information is retained by Zephyr and made
available to any authenticated user who requests such. Login and logout announcements will be
sent to any user has requested such. Default subscriptions and any additional personal
subscriptions will be entered for the user.
EXAMPLES
zctl Runs zctl in interactive mode.
zctl load Load subscriptions and un-subscriptions from $HOME/.zephyr.subs file.
zctl sub message personal
Subscribe to personal messages, but don't add this to the subscriptions file.
zctl save Save all current subscriptions to the default subscriptions file.
zctl set exposure none Set your exposure level to `none', effectively turning off Zephyr.
SEE ALSO
zephyr(1), zwgc(1), zhm(8), zephyrd(8) gethostbyname(3)
Project Athena Technical Plan Section E.4.1, `Zephyr Notification Service'
FILES
/tmp/wg.*
$HOME/.zephyr.subs
$ZEPHYR_VARS or $HOME/.zephyr.vars
/etc/zephyr/zephyr.vars
AUTHOR
Robert S. French (MIT-Project Athena)
RESTRICTIONS
Copyright (c) 1987,1988 by the Massachusetts Institute of Technology. All Rights Reserved.
zephyr(1) specifies the terms and conditions for redistribution.
MIT Project Athena July 1, 1988 ZCTL(1)