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Last Updated: January 3, 2015
Linux administrator really should be familiar with CLI environment. Since GUI mode in Linux servers will not be a common to be installed. SSH may the favourite protocol make it possible for Linux administrator to control the servers via remote in secure way. Built-in with SSH command there may be SCP command. SCP is needed to copy files between servers in secure way.
There are a lot easier parameters in SCP command that can be used. Here are the parameters which will useful on day after day usage.
Basic SCP command without parameter will copy the files in background. User will dsicover nothing unless the operation is done or some error appears. You can use - v parameter to print debug information in to the screen. It can help you debugging connection, authentication and configuration problems.
pungkimint/Documents scp - v :.
Executing: program/usr/bin/ssh host, user mrarianto, command scp - v - t. OpenSSH6.0p1 Debian-3, OpenSSL 1.0.1c 10 May 2012 debug1: Reading configuration data/etc/ssh/sshconfig debug1:/etc/ssh/sshconfig line 19: Applying alternatives for debug1: Connecting to port 22. debug1: Connection established. debug1: Host is famous and matches the RSA host key. debug1: Found enter in /knownhosts:1 debug1: sshrsaverify: signature correct debug1: Next authentication method: password s password: debug1: Authentication succeeded password. Authenticated to :22. Sending file modes: C0770 3760348 Sink: C0770 3760348 100% 3672KB 136.0KB/s 00:27 Transferred: sent 3766304, received 3000 bytes, in 65.2 seconds Bytes per second: sent 57766.4, received 46.0 debug1: Exit status 0
The - p parameter will allow you to on this. An estimated some time and the connection speed look on the screen.
pungkimint/Documents scp - p :.
s password: 100% 3672KB 126.6KB/s 00:29
One of parameter that may faster your file transfer is - C parameter. The - C parameter will compress your files away from home. The unique thing could be the compression is merely happen in the network. When the file is arrived to the destination server, it'll returning to the original size as prior to a compression happen.
Take a peek of these commands. It is having a single file of 93 Mb.
pungkimint/Documents scp - pv :.
Executing: program/usr/bin/ssh host, user mrarianto, command scp - v - p - t. OpenSSH6.0p1 Debian-3, OpenSSL 1.0.1c 10 May 2012 debug1: Reading configuration data/etc/ssh/sshconfig debug1:/etc/ssh/sshconfig line 19: Applying choices for debug1: Connecting to port 22. debug1: Connection established. debug1: identity file /idrsa type - 1 debug1: Found input /knownhosts:1 debug1: sshrsaverify: signature correct debug1: Trying private key: /idrsa debug1: Next authentication method: password s password: debug1: Authentication succeeded password. Authenticated to :22. debug1: Sending command: scp - v - p - t. File mtime 1323853868 atime 1380425711 Sending file timestamps: T1323853868 0 1380425711 0 100% 93MB 58.6KB/s 27:05 Transferred: sent 97614832, received 25976 bytes, in 1661.3 seconds Bytes per second: sent 58758.4, received 15.6 debug1: Exit status 0
pungkimint/Documents scp - Cpv :.
Executing: program/usr/bin/ssh host, user mrarianto, command scp - v - p - t. OpenSSH6.0p1 Debian-3, OpenSSL 1.0.1c 10 May 2012 debug1: Reading configuration data/etc/ssh/sshconfig debug1:/etc/ssh/sshconfig line 19: Applying selections for debug1: Connecting to port 22. debug1: Connection established. debug1: identity file /idrsa type - 1 debug1: Host may be known and matches the RSA host key. debug1: Found get into /knownhosts:1 debug1: sshrsaverify: signature correct debug1: Next authentication method: publickey debug1: Trying private key: /idrsa debug1: Next authentication method: password s password: debug1: Enabling compression at level 6. debug1: Authentication succeeded password. Authenticated to :22. debug1: channel 0: new client-session debug1: Sending command: scp - v - p - t. File mtime 1323853868 atime 1380428748 Sending file timestamps: T1323853868 0 1380428748 0 Sink: T1323853868 0 1380428748 0 Sending file modes: C0600 97517300 100% 93MB 602.7KB/s 02:38 Transferred: sent 8905840, received 15768 bytes, in 162.5 seconds Bytes per second: sent 54813.9, received 97.0 debug1: Exit status 0 debug1: compress outgoing: raw data 97571111, compressed 8806191, factor 0.09 debug1: compress incoming: raw data 7885, compressed 3821, factor 0.48
As you will see, when you find yourself using compression, transfer process is finished in 162.5 second. It is ten times faster absolutely nothing using - C parameter. If you are copying a great deal files over the network, - C parameter would assist you to decrease the total time you'll need.
The thing that people should discover that compression method won't work on any files. When the source file is compressed, you will not likely find any improvement there. Files for instance,, pictures, and files will not likely affected by - C parameter.
pungkimint/Documents scp - c 3des :. s password: 100% 3672KB 282.5KB/s 00:13
Another parameter which could useful is - l parameter. The - l parameter will limit the bandwidth make use of. It are going to be useful if you undertake an automation script copying a lot of file, and you donР‘t want the bandwidth is drained through the SCP process.
pungkimint/Documents scp - l 400 :. s password: 100% 3672KB 50.3KB/s 01:13
Usually SCP is employing port 22 like a default port. But for security reason, you might change the port into another port. For example, we're using port 2249. Then the command must be like this.
pungkimint/Documents scp - P 2249 :. s password: 100% 3672KB 262.3KB/s 00:14
pungkimint/Documents scp - r documents :. s password: 100% 3672KB 282.5KB/s 00:13 100% 10KB 9.8KB/s 00:00
When the copy process is finished, in the destination server you may found a directory named Р‘ documents Р‘ with all of itР‘s files. The folder Р‘ documents Р‘ is automatically created.
If you select not to see progress meter and warningdiagnostic messages from SCP, you could disable it using - q parameter. HereР‘s the example.
pungkimint/Documents scp - q :. s password: pungkimint/Documents
As you can view, following you enter the password, there's no any info on SCP process. After the operation is complete, you might be go to a prompt again.
Proxy server is often used in place of work. Natively, SCP just isn't proxy configured. When your environment using proxy, you must Р‘tellР‘ SCP to speak with the proxy.
HereР‘s the scenario. The proxy address is 10.0.96.6 plus the proxy port is 8080. The proxy also implemented user authentication. First, you will need to create /config file. Second you add this command inside.
ProxyCommand/usr/bin/corkscrew 10.0.96.6 8080 %h %p /proxyauth
After you're able to do SCP transparently as usual.
Please realize that corkscrew is probably won't installed yet with your system. On my Linux Mint, I need to handle the installation first, using standard Linux Mint installation procedure.
For other yum based systems, users can install corkscrew while using the following yum command.
For mobile user who often switch between company network and public network, it is going to be suffer to always change settings in SCP. It is better when we can put a new sshconfig file to fit our needs.
Proxy can be used in company network and not in public network and you are therefore regularly switch network.
pungkimint/Documents scp - F/home/pungki/proxysshconfig :. s password: 100% 3672KB 282.5KB/s 00:13
By default sshconfig file per user is going to be placed in /config. Creating a specific sshconfig file with proxy compatible, forces you to easier to switch between networks.
ThatР‘s information on SCP. You can see man pages of SCP for much more detail. Please feel free to leave comments and suggestions.
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It is effective article. But chances are you'll mention how to duplicate local to remote, remote to local, remote to remote and all sorts of. Anyway it s good.
Nice Article. After reading entire article- Very impressive. Most of the time I was used general scp - pr, now I understand the significance of this scp command with detailed info. New thing is learned scp - C Good to listen to all and intensely good article.DBA
Nice article. Covers more useful SCP options inside a detailed manner. Helps me alot to find out about SCP command. appreciate your information.
Great article. I had a problem with a password-less login via ssh and rsync. There was a Linux ftp server that have a mounted CIFS Win2003 share around the back end. For the life of me I couldn t get rsync to duplicate. So my wild guess was the CIFS mount was within windows security contact where by rsync had no having access to.
I tried scp and from now on I can copy file flawless.
Just my two cents. Again great article!
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2015 unix commands with examples and syntax pdf free download