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I run a process which outputs data I would like to store somewhere so that another process, at some point, can read that file.

Is there a traditional place where such files are stored?

  • I could use /var/run or /run but these are expected to be cleared when rebooting - I want my files to be persistent across reboots
  • I could use /myowndircetoryforpersistantfiles and it would work, I am curious if there is something intended for such use

Maybe /var/log? (though this is not really a log file)

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Depending on the type of data, you could use /var/lib, or /var/tmp. From the Filesystem Hierarchy Standard 3.0:

  • /var/lib:

    This hierarchy holds state information pertaining to an application or the system. State information is data that programs modify while they run, and that pertains to one specific host. [...]

    State information should generally remain valid after a reboot, should not be logging output, and should not be spooled data.

    An application (or a group of inter-related applications) must use a subdirectory of /var/lib for its data. [...]

    /var/lib/<name> is the location that must be used for all distribution packaging support. Different distributions may use different names, of course.

  • /var/tmp:

    The /var/tmp directory is made available for programs that require temporary files or directories that are preserved between system reboots. Therefore, data stored in /var/tmp is more persistent than data in /tmp.

    Files and directories located in /var/tmp must not be deleted when the system is booted. Although data stored in /var/tmp is typically deleted in a site-specific manner, it is recommended that deletions occur at a less frequent interval than /tmp.

If you can consider the data to be "state information" for the group of applications comprising the two processes, then /var/lib/<subdir> seems to be a good fit. If not, /var/tmp/<...>.

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