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This command will copy a folder tree (keeping the parent folders) through ssh. It will:
- compress the data
- stream the compressed data through ssh
- decompress the data on the local folder
This command will take no additional space on the host machine (no need to create compressed tar files, transfer it and then delete it on the host).
There is some situations (like mirroring a remote machine) where you simply cant wait for a huge time taking scp command or cant compress the data to a tarball on the host because of file system space limitation, so this command can do the job quite well.
This command performs very well mainly when a lot of data is involved in the process. If you copying a low amount of data, use scp instead (easier to type)
Ever compress a file for the web by replacing all newline characters with nothing so it makes one nice big blob?
It is a great idea, however what about when you want to edit that file? ...Serious pain in the butt.
I ran into this today in that my only copy of a CSS file was "compressed" with no newlines.
I whipped this up and it converted back into nice human readable CSS :-)
It could be nicer, but it does the job.
a - archive
m5 - compression level, 0= lowest compression...1...2...3...4...5= max compression
-v5M split the output file in 5 megabytes archives, change to 700 for a CD, or 4200 for a DVD
R recursive for directories, do not use it for files
It's better to have the output of a compression already split than use the 'split' command after compression, would consume the double amount of disk space. Found at http://www.ubuntu-unleashed.com/2008/05/howto-create-split-rar-files-in-ubuntu.html