Cascade DataHub: Version 4.0
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# datahub

datahub -- starts the Cascade DataHub.

## Synopsis

datahub [`-aDhstvVX`] [`-b `size``] [`-d `domain``] [`-q `queue``]

## Arguments

`-a`

  Re-transmit all point messages to all registered clients, even if the value did not change.

`-b `size``

  The maximum message buffer size.

`-d `domain``

  The domain name for this datahub.

`-D`

  Do not detach from the controlling tty. Normally the datahub will detach itself and become immune to interrupts and termination on the controlling tty. If this option is used, then the `&` is necessary to run datahub in the background.

`-h`

  Print a help message showing a summary of all these arguments.

`-q `queue``

  Specify an alternate queue name for this datahub. Normally datahub chooses its own queue name to be unique on the network.

`-s`

  Synchronized: The datahub will ignore changes to a point if the point's current timestamp is more recent.

`-t`

  Automatically generate a timestamp on unstamped points.

`-v`

  Generate copious debugging information to the standard output. (Implies use of `-n`).

`-V`

  Print the version number.

`-X`

  Exit immediately (usually used with `-V`).

## Returns

On success, nothing; on error, a message.

## Description

The datahub utility is the Cascade DataHub (datahub). The datahub does not use a configuration file since it is configured by its clients while running.

## Dependencies

qserve, nserve

## See Also

Running the Cascade DataHub, dhview, phdhview, xdhview

## Example

        [sh]$  datahub

Starts the datahub in the domain `default`.

        [sh]$  datahub -d control

Starts the datahub in the domain `control`.

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