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Re^4: Finding and sorting files in massive file directory

by CColin (Scribe)
on Jan 21, 2013 at 08:35 UTC ( #1014410=note: print w/ replies, xml ) Need Help??


in reply to Re^3: Finding and sorting files in massive file directory
in thread Finding and sorting files in massive file directory

Hi,

I'd like to be able to combine the distinct file types into single compressed tar files. There are approx 5 types, split roughly c. 1 million for one type and the other 4 c. 300k - 500k each.

Yes, the files need to be deleted afterwards to make disk space for incoming.

Colin


Comment on Re^4: Finding and sorting files in massive file directory
Re^5: Finding and sorting files in massive file directory
by dave_the_m (Parson) on Jan 21, 2013 at 11:21 UTC
    If there is a process adding new files to the directory while your "tar up" script is running, then you need to face the twin issues of deleting files which haven't been put in the tar file, and putting empty or half-written files into the tarball. If possible, you need to be able to stop the process from adding any new files while the script is running; but if you can't, then the following should be safe.

    Use the script I gave you above to, for example, move all files starting with 'b' into a b/ subdirectory. Then wait a few minutes, or however long it could reasonably take for the process to finish writing the current file, then from the command line, simply:

    $ tar -cfz .../some-path/b.tar.gz b/ $ tar -tfz .../some-path/b.tar.gz > /tmp/foo View /tmp/foo in a text editor to see if it looks reasonable, then $ rm -rf b/
    If the rm fails due to too many files, then write another perl script similar to the one above, but using 'unlink' to remove each file one by one.

    Dave.

      Also, on Linux the inotify interface provides a way to discover when new files are created/open and later closed.
      Thanks, I'll try it.

      I am intrigued by your earlier reference to Archive::Tar. I did look at the module briefly but it seemed rather complicated. What would it add over and above using readdir with while and basic unix commands?

        What would it add over and above using readdir with while and basic unix commands
        It allows you to programmatically to select, add files etc, without having to fork out to an external program. For example, if you didn't need to delete the files afterwards, you could have just used my original script, with $tar->add($file) for each matching file. No need to fork out, no command line length limitations etc.

        Dave.

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