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This question already has an answer here:

Is it possible to create a virtual file in unix, whose contents are determined programmatically when the file is accessed, a bit like the files in /proc?

For example, I have a program that retrieves a particular setting by reading/catting a file. However, rather than store that setting directly in a plain text file, I want to be able to retrieve that setting from a database in the background and then pass that information to the program when it reads this virtual file. Is it possible to do so?

marked as duplicate by Stéphane Chazelas, Jakuje, Anthon, MelBurslan, chaos Apr 12 '16 at 19:35

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You could look at Named Pipes.

man fifo for a starting point.

Essentially you create a named pipe, one process (or more) reads from it and another can write to it.

  • In addition to named pipes, you could also consider unix domain sockets. – Andy Dalton Apr 12 '16 at 14:57
  • Named pipes are problematic when you have multiple simultaneous readers; you'll frequently get a reader that gets part of the data. Sockets are a problem when you have no control over the reader; you can't open a socket the same way you can a file or pipe. – Chris Cogdon Dec 5 '17 at 17:26

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