zephyr(1) [debian man page]
ZEPHYR(1) General Commands Manual ZEPHYR(1) NAME
zephyr - Zephyr Notification Service DESCRIPTION
Zephyr is a notice transport and delivery system developed at MIT which runs under 4.3BSD Unix. A Notice Transport and Delivery system is a method of getting small quantities of time sensitive information efficiently from one client (or server) on a network to another. The object is to accomplish this with the highest possible fan-out (i.e., client to server ratio) while maintaining both network and server performance. Zephyr is a multi-cast notice transport and delivery system based upon an authenti- cated datagram protocol. Localized Zephyr servers provide routing, queueing and dispatching services to clients which communicate with them via the Zephyr Client Library. Two special purpose Zephyr clients, the WindowGram client and the HostManager client provide user and client host communication support. Zephyrd(8) servers run on designated server machines. These servers maintain a database of subscriptions and locations for every user using Zephyr. The servers stay in contact with one another, and provide a reliable backup system (via duplication) in the event of network failures. Each client machine on the network runs a zhm(8) HostManager client program which is the link between the Zephyr servers and the users. User programs send notices to the HostManager, and the HostManager forwards these notices to the nearest server for action. The HostMan- ager is responsible for ensuring that the notices reach a server, and for finding a new one if its server fails to respond. Each user on the network usually runs a WindowGram client program automatically upon login. Zwgc(1) displays notices to the user, and han- dles user responses. Only notices to which the user has subscribed will be sent to the WindowGram client. Subscriptions are handled through the zctl(1) program. This program allows the user to add or delete subscriptions from Zephyr, to add the subscriptions to a file, and to perform other miscellaneous functions. SEE ALSO
kerberosintro(1) zaway(1), zctl(1), zleave(1), zlocate(1), znol(1), zwgc(1), zwrite(1), zmailnotify(1) zhm(8), zephyrd(8), zinit(8), zstat(8), zpopnotify(8), zshutdown_notify(8), syslogd(8) Project Athena Technical Plan Section E.4.1, `Zephyr Notification Service' AUTHORS
Tony Della Fera (MIT-Project Athena, DEC), Mark W. Eichin (MIT-Project Athena), Robert S. French (MIT-Project Athena), David C. Jedlinsky (MIT-Project Athena), John T. Kohl (MIT-Project Athena, DEC), William E. Sommerfeld (MIT-Project Athena). RESTRICTIONS
Copyright (c) 1987,1988,1989 by the Massachusetts Institute of Technology. All Rights Reserved. Permission to use, copy, modify, and distribute this software and its documentation for any purpose and without fee is hereby granted, pro- vided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in sup- porting documentation, and that the name of the Massachusetts Institute of Technology not be used in advertising or publicity pertaining to distribution of the software without specific, written prior permission. M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL M.I.T. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. MIT Project Athena July 1, 1988 ZEPHYR(1)
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ZWRITE(1) General Commands Manual ZWRITE(1) NAME
zwrite - write to another user via Zephyr SYNOPSIS
zwrite [ -a ] [ -d ] [ -v ] [ -q ] [ -t ] [ -u ] [ -o ] [ -n ] [ -l ] [ -C ] [ -O opcode ] [ -s signature ] [ -c class ] [ -i instance ] [ -r realm ] [ -f arg ] [ user ... ] [ -m message ] DESCRIPTION
Zwrite sends a message from you to another user through the zephyr(1) notification service. The user must have subscribed to messages of the appropriate class and instance using the zctl(1) program. Zwrite understands the following options. -a Causes zwrite to send the message authenticated, using Kerberos to perform the authentication. This is the default. -d Causes zwrite to send the message unauthenticated. -v Causes zwrite to print what type of message it is sending, and whether or not it was successful. -q Forces zwrite to suppress information about whether or not the message was sent. -t Prevents zwrite from expanding tabs in the message into appropriate spaces. Normally zwrite will expand any tabs it finds into the appropriate number of spaces to maintain separation based on 8-character tab stops. -l Causes zwrite to ignore `.' on a line by itself in the input and only end a typed message when the user types the end-of-file character (usually control-D). When the input is not a terminal, this is the default action. -u Sends an urgent message. This changes the zephyr instance of the message to ``URGENT''. -o Causes zwrite to ignore the Zephyr variables zwrite-class, zwrite-inst, and zwrite-opcode when picking a default class, instance, and opcode. -n prevents zwrite from sending a PING message to verify the recipient is subscribing to messages. By default, zwrite will send a notice to the destination class, instance, and recipient, with opcode ``PING'' before sending the message. If the PING is sent, and the server response indicates there are no recipients subscribed to your message, zwrite exits without sending a mes- sage. When the -n option is used, no PING is sent. -C prepends a "CC:" line to the body of the message indicating the recipients of the message. This is strictly a convenience: the presence of a "CC:" line at the top of a zephyr body does not necessarily indicate that this option was used, or that the mes- sage really was sent to the listed users, and its lack doesn't indicate that the message was not sent to multiple users. -s signature sets the signature to be included in the message. This overrides both the user's name (as found in the password file) and any setting of the Zephyr variable zwrite-signature. signature must be a single argument, hence when using a shell it should be quoted with double quotes. A signature argument of "" leaves the signature in the message empty. -c class Allows a user to specify a different class for the message. This allows a message to be sent to a large group of people with some degree of security. See zephyr(1) and zephyrd(8) for a description of how to restrict access to classes. When this option is specified, the message is sent to recipient "*" unless an additional list of recipients is specified. This argument may not be used in conjunction with the -f option. -i instance Allows a user to specify a different instance than the default. When this option is used, the message is sent to recipient "*" unless an additional list of recipients is specified. This allows a message to be sent to a large group of people (e.g. a development group) just by having the members subscribe to messages of class "MESSAGE", the specified instance, and recipient "*". This argument may not be used in conjunction with the -f option. -r realm Allows a user to specify a different realm for the message, if the server supports interrealm Zephyr. -F format Allows a user to specify a different default format for the message. -O opcode Allows a user to specify a different opcode for the message. Some Zephyr notice display programs may use the opcode to decide how to display a notice. -f arg Allows a user to specify an argument to be interpreted as a filesystem specification. The class is set to FILSRV. he instance is set to arg as modified: If arg contains no colons (`:'), it is assumed to be a host name, and it is converted into an offi- cial host name via gethostbyname(3). If arg contains a colon, the portion preceding the colon is treated as a host name, and the colon and any trailing characters are appended to the offical host name returned by gethostbyname. If the name fails to resolve into an official host name, the instance is set to arg unmodified. This option may not be used in conjunction with the -c or -i option. -m Zwrite sends the remaining arguments on the command line as the message. If the -m option is not specified, the user is prompted for the message to be sent. The message may be terminated by typing ^D or ``.'' on a line by itself. The default class for messages is ``MESSAGE'', the default instance is ``PERSONAL'', andthe default opcode is ``'' (an empty string). These defaults can be overridden by setting the Zephyr variables zwrite-class, zwrite-inst, and zwrite-opcode, respectively. Command-line options can override the defaults. If the class is ``MESSAGE'' and the instance is either ``PERSONAL'' or ``URGENT'', a recipient must be specified. These comparisons are case-sensitive. Unless the -s option is used, the contents of the Zephyr variable zwrite-signature are used to augment the user's username in the message. If zwrite-signature is not set and the -s option is not specified, the user's full name (as specified in the password file) is used instead. BUGS
Tab expansion should really be done by the receiver of the message. The -u option is provided for compatibility with old versions of zwrite and is not necessarily useful for sending messages to users who do not have old subscription files. SEE ALSO
kerberosintro(1), zctl(1), zephyr(1), zwgc(1), zhm(8), zephyrd(8), gethostbyname(3) Project Athena Technical Plan Section E.4.1, `Zephyr Notification Service' FILES
/etc/passwd $ZEPHYR_VARS or $HOME/.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 October 26, 1989 ZWRITE(1)