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[LDM #CMI-630638]: LDM

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [LDM #CMI-630638]: LDM
  • Date: Tue, 21 Feb 2017 10:27:11 -0700
Shengting,

> It's great to hear back from you. As always, we are grateful for all your 
> help. I have a question that may be easy for you but for a beginner may not 
> be that straightforward. That is: How do I stream data from the server? What 
> commands do I use? Or is there a web link you can point me to to learn about 
> it?

One doesn't "stream" data from the LDM system. Instead, one starts-up one or
more pqact(1) processes via EXEC entries in the LDM configuration-file and
those processes perform actions on matching incoming data-products. The most
common actions are to write the data-product to a file (FILE action) or pipe
the data-product to a "decoder" (PIPE action).

Information on the LDM configuration-file can be found at
<http://www.unidata.ucar.edu/software/ldm/ldm-current/basics/configuring.html#ldmd.conf>
and
<http://www.unidata.ucar.edu/software/ldm/ldm-current/basics/ldmd.conf.html>

Information on the pqact(1) configuration-file can be found at
<http://www.unidata.ucar.edu/software/ldm/ldm-current/basics/pqact.conf.html>

Regards,
Steve Emmerson

Ticket Details
===================
Ticket ID: CMI-630638
Department: Support LDM
Priority: Normal
Status: Closed
===================
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