man zwrite (Commandes) - write to another user via Zephyr
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 message. When the -m 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 message 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 official 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
$HOME/.zephyr.vars
AUTHOR
Robert S. French (MIT-Project Athena)