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man pages section 1M: System Administration Commands

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Updated: July 2017



in.comsat, comsat - biff server




comsat is the server process which listens for reports of incoming mail and notifies users who have requested to be told when mail arrives. It is invoked as needed by inetd(1M), and times out if inactive for a few minutes.

comsat listens on a datagram port associated with the biff service specification (see services(4)) for one line messages of the form

user@mailbox -offset

If the user specified is logged in to the system and the associated terminal has the owner execute bit turned on (by a biff y), the offset is used as a seek offset into the appropriate mailbox file, and the first 7 lines or 560 characters of the message are printed on the user's terminal. Lines which appear to be part of the message header other than the From, To, Date, or Subject lines are not printed when displaying the message.



user access and administration information


See attributes(5) for descriptions of the following attributes:


See Also

svcs(1), inetadm(1M), inetd(1M), svcadm(1M),services(4), attributes(5), smf(5)


The message header filtering is prone to error.

The in.comsat service is managed by the service management facility, smf(5), under the service identifier:


Administrative actions on this service, such as enabling, disabling, or requesting restart, can be performed using svcadm(1M). Responsibility for initiating and restarting this service is delegated to inetd(1M). Use inetadm(1M) to make configuration changes and to view configuration information for this service. The service's status can be queried using the svcs(1) command.

Note - This command is obsolete and will be removed in a future release of Oracle Solaris.