There is a dirty little secret the Mac hides from you when you are using it but becomes a glaring eyesore when you move to another OS. Some file clean up needs to happen because OSX creates these hidden files that start with a ._ which contains some extended information about the file that no other system reads so they aren’t terrible useful when moving files to these systems. This post from a person working for Splunk, outlines how to tar up files on a OSX machine that is targeted for other systems and exclude the ._ files from the tarring process. Original article can be found here

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When building Splunk applications, I’m often working on a Mac. There
are files that begin with ._ that are resource files, which contain
extended attribute information about the files for the OS. This is
great and all but I don’t want to include these files when I package up
an application and upload it to SplunkBase.

If you don’t have deep OSX knowledge, then keeping these files out
of your tarball is harder than it looks. One of our OSX gurus pointed
me toward the answer, and I was so excited (yes, I am a geek) that I
just had to share.

To build a tarball in Leopard that doesn’t contain the ._ files, use:

COPYFILE_DISABLE=true tar cvzf filename.tar.gz dirtotar

In Tiger, use:

COPY_EXTENDED_ATTRIBUTES_DISABLE=true tar czvf filename.tar.gz dirtotar

This is definitely going in my .bashrc so I don’t have to fuss with it again:

export COPYFILE_DISABLE=true

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