comsat - The biff server
comsat
The comsat server receives reports of incoming mail and
notifies users who request this service. comsat is
invoked by the inetd(8) daemon when it receives messages
on a datagram port associated with the biff(1) service
specification in /etc/services(4). The datagram contains a
1-line message of the form: user@mailbox-offset
If the user specified is logged in and the associated terminal
has the owner execute bit turned on (with biff y),
offset is used as a seek offset into the file named in
mailbox. The first 7 lines or 560 characters of the message
are printed on the user's system. The message
excludes mail header lines other than the From or Subject
lines.
The comsat command always tries to convert incoming mail
messages from the mail interchange codeset to the user's
application codeset. It determines the mail interchange
code first by checking the mail message itself to see if
it contains the required information. Otherwise, the system-wide
default mail interchange code in the file
/usr/lib/mail-codesets will be used. If no such system
file exists, no codeset conversion will be performed.
The determination of the user's application code in each
terminal session is by one of the following methods. The
application codeset defined in the user's Asian tty
driver. The codeset name stored in the ~/.codesetdevname
file, where devname is the name of the terminal device for
the current terminal session. You can obtain the value of
devname by issuing the tty command. For example, if the
tty command returns /dev/ttys8, use ttys8 as the value for
devname. The lang valued option defined in $HOME/.mailrc
or /usr/share/lib/Mail.rc.
Specifies the command path. Includes information about
logged-in users and their associated ttys. File containing
mailx subcommands to customize mailx for a specific
user. File containing mailx subcommands to change mailx
for all users on the system.
Commands: biff(1), inetd(8), mailx(1), mh(1)
Files: services(4), inetd.conf(4), tty(7)
comsat(8)
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