Move files around local filesystem with tar without wasting space using an intermediate tarball.

( cd SOURCEDIR && tar cf - . ) | (cd DESTDIR && tar xvpf - )

7
By: res0nat0r
2009-06-26 19:13:51

3 Alternatives + Submit Alt

What Others Think

Why would you do this as opposed to cp -r? Is this faster? I'm too lazy to try it out...
blue_beastie · 639 weeks and 3 days ago
Well, for starters it preserves ownership, mode, timestamps, and links. Then again, so does cp -a, so I really don't know.
TheMightyBuzzard · 639 weeks and 3 days ago
cp's -a switch does --recursive, --preserve=mode,ownership,timestamps,links and --no-dereference I fail to see the point in using tar like this. Anyone? It'd make more sense if the extract command was an arg to ssh, to happen on a remote machine, and tar was set to compress the data.
tremby · 639 weeks and 2 days ago
Depending on where the source and destinations live (same partition, same disk, same machine) this approach can have merit sometimes because it introduces a buffering via the pipe and the reading and writing are driven by two different tar processes rather than a single cp process. If it is faster that way, I think that would be why. However, on the same machine I don't think this is likely to be faster, but I have definitely verified that when copying files between machines in this way (via putting an ssh user@host in front of either cmd) can be way faster than a single scp command, due to the buffering.
bwoodacre · 639 weeks and 1 day ago
Oh, the old classic ;-)
oernii2 · 639 weeks and 1 day ago
That way more reliable when using nfs. I didn't believe it, but it happened to me that on some systems (tru64, aix, solaris) cp-ing tonns of files to nfs3 fails while tar | tar - works smoothly... Anyway it could be that on newer release of nfs those issues won't arise.. but if you want to be sure...tar is for free :P
ioggstream · 639 weeks ago
No need to imagine a pat on the back
yeoyeo · 6 weeks and 2 days ago

What do you think?

Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?

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