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I have a bunch of tar files such as a.tar b.tar. I use the following command to merge two tar files :

tar --concatenate --file=a.tar b.tar

However, --concatenate is not support on mac terminal 10.7.4 . What I need to do ?

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try tar --file=Merged.tar --create file1.txt file2.txt and tell me if that is what you're looking for. If it is, post back and i will explain what i just showed you. This is basically how you make a "tar ball" – AlanTuring Nov 9 '12 at 23:48
check my edit ? this was helpful @AlanTuring – catminhvo Nov 9 '12 at 23:51
it should still hold true for tar files, give it a swirl. Do you want me to post an answer? – AlanTuring Nov 9 '12 at 23:53
yup, thanks very much @AlanTuring – catminhvo Nov 9 '12 at 23:57

There's a wonderful notion in the tar realm called a tar-ball. Basically it behaves very much the same way a real tarball would. It's sticky and you can throw stuff at it and it will stick!

So the basic Tar usage is:

tar --file=path_to_tarball --subcommand [--subcommand] \ [path_to_payload [path_to_payload]]

now let's see it in an example.

tar --file=Merged.tar --create file1.txt file2.txt

This creates a tarball of the 2 files file1 and file2. As i said earlier you can throw things at the tarball and it will still be fine!

tar --file=Merged.tar --append file3.txt

So as you can see the tarball just gets bigger and bigger!

Since you can imagine this to be a rather big ball lying around after some time, perhaps you want to retrieve something from it after a while? Or maybe even delete it?

To extract a file out of the tar ball we have

tar --file=Merge.tar --extract fileX.txt

and to delete it

tar --file=Megre.tar --delete fileX.txt

for a list of other awesome things you can do with the tar tool, head on over to MacTech

share|improve this answer
+1 thanks AlanTuring for the link and some helpful stuff – catminhvo Nov 10 '12 at 0:17
you aint going to accept it lol? – AlanTuring Nov 10 '12 at 3:29

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