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Editor to share with you how to solve the problem of copying files between Linux systems. I hope you will get something after reading this article. Let's discuss it together.

The first method

First of all, when many files need to be moved or copied locally or remotely and are not too large, it is inefficient to use the cp command and mv command. You can first use the tar tool to package / compress the content to be copied / moved, then copy / move, and finally unpack / decompress.

In addition, it is also a key technique, that is, you do not have to copy and unpack / decompress the tar after it has been packaged / compressed, you can perform copy / unpacking / decompression on one side of the pipeline.

For example, the tar command can be combined with the nc command to quickly transfer files and directories between two machines:

Machine B:

The code is as follows:

Nc-l 5555 | tar-C / tmp/test/-xf-

A machine:

The code is as follows:

Tar cf-/ tmp/test/ | nc B'IP 5555

The above steps copy the contents under machine A / tmp/test/ to the corresponding directory of machine B, where tar cf-/ tmp/test/ | nc B'IP 5555 transfers the content through pipes and nc commands to machine B via the corresponding IP address and port 5555, nc-l 5555 | tar-C / tmp/test/-xf-listens on port 555 of the machine. And unpack the received content to the specified directory (the-C parameter specifies the target directory)

The second method

Combine tar with the scp, ssh commands:

After packing in machine A, copy it to machine B and unpack it.

The code is as follows:

Tar-cf-/ tmp/test | ssh B'IP "cd / tmp; tar-xf -"

Pack in machine An and copy the packaged files to machine B.

The code is as follows:

Tar-cf-/ tmp/test | ssh B'IP "cd / tmp; cat-> test.tar"

Tar-cf-/ tmp/test | scp-B'USER@B'IP:/tmp

Copy the packing file of machine A to machine B and unpack it.

The code is as follows:

Zcat test.tar | ssh B'IP "cd / tmp; tar-xf -"

You can also use it directly locally:

The code is as follows:

Cd / tmp/test1

Tar-cf -. | (cd / tmp/test2; tar-xvpf -)

However, some people have come to the conclusion that it is faster to use cp directly locally.

When copying, a directory is copied in addition to a single file, sometimes along with the attributes of the file / directory. You can use the-R parameter to recursively copy the directory in the cp command, the-p parameter to copy the file retention attributes (by default: mode,ownership,timestamps can also specify the attributes to be specially retained through-- preserve [= ATTR_LIST], such as: context, links,xattr, all), and use the-d parameter to copy the file to retain the connection. Or simply use the-a parameter (equivalent to using-dR-- preserve=all)

If you want to see the progress of copying a large number of small files, you can write a simple script:

The code is as follows:

Cd / tmp/test

For i in *

Do

Cp $I destination directory

Echo $I is ok....

Done

After reading this article, I believe you have a certain understanding of "how to solve the problem of copying files between Linux systems". If you want to know more about it, you are welcome to follow the industry information channel. Thank you for reading!

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