Ssh – file transfer with ssh pipe; without scp

file-transferpipescpssh

Scenario: I'm having about hundred odd text files which are compressed as .gz. They need to be transferred to a remote server. I do not want to use scp. Both, linux servers.

my requirement/my idea: I want to write and execute a bash script on source server for this. What I want is like zcat each of the files, pipe that output over ssh user@remote(its already configured passwordless), then have those outputs redirected into a text file on the remote server. Is this way correct? If so how to implement this?

Thanks,

Best Answer

You can simply do it like this:

for file in $(ls dir/); do zcat ${file} | ssh user@remote "cat > /path/${file}"; done

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Ssh – way to SSH / SCP to another server as a different user, via a script

"Corporate S(tupidity)" :-)

SSH / SCP generally lives with the realm of UNIX philosophy I think. It is very rare that the designers of Unix applications intentionally make it so the administrator can't easily do something stupid. There will be generally be a warning like: "You probably don't want to do this because ... but, if you really want to, fine!".

In the case of passing a password to ssh in a script, they intentionally make this difficult, because it just such a bad idea.

At this point, I wouldn't even bother with SSH. You really need to talk with the corporate security people and come up with a real solution for the scenario. If they don't want to use keys, ask them what you should do. If that doesn't work, tell your managers what they want can't be done due to corporate security restrictions. If the managers do insist that you do this, get it in writing, or it is your ass on the line

Ssh – How to automate SSH login with password

Don't use a password. Generate a passphrase-less SSH key and push it to your VM.

If you already have an SSH key, you can skip this step… Just hit Enter for the key and both passphrases:

$ ssh-keygen -t rsa -b 2048
Generating public/private rsa key pair.
Enter file in which to save the key (/home/username/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/username/.ssh/id_rsa.
Your public key has been saved in /home/username/.ssh/id_rsa.pub.

Copy your keys to the target server:

$ ssh-copy-id id@server
id@server's password:

Now try logging into the machine, with ssh 'id@server', and check-in:

.ssh/authorized_keys

Note: If you don't have .ssh dir and authorized_keys file, you need to create it first

to make sure we haven’t added extra keys that you weren’t expecting.

Finally, check to log in…

$ ssh id@server

id@server:~$

You may also want to look into using ssh-agent if you want to try keeping your keys protected with a passphrase.

Best Answer

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Ssh – way to SSH / SCP to another server as a different user, via a script

Ssh – How to automate SSH login with password

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