How to pass variables in remote SSH command stack?

How to pass variables in remote SSH command stack?

$BUILD_NUMBER is set on the machine making the ssh call and since the variable doesn’t exist on the remote host, it doesn’t get picked up. How do I pass the value of $BUILD_NUMBER ?

Can you set SSHD to a higher port?

Not a real security measure but makes your logs less dirty: set sshd to a higher port. You of course have disabled password authentication and you use public/private key based authentication, right? Buy, you might have that one host which is for whatever reason is not able to use ssh keys.

How to access variables outside of the SSH session?

If you really want to set the environment variable on the remote host and use it, you can use the env program Escape the variable in order to access variables outside of the ssh session: ssh [email protected] “~/tools/myScript.pl \\$BUILD_NUMBER”

What are the options for a SSH match pattern?

The list below are all the options supported in an SSH Match pattern: ChallengeResponseAuthentication ChallengeResponseAuthentication HostbasedUsesNameFromPacketOnly KbdInteractiveAuthentication

Is it possible to pass environment variables through SSH?

A really simplified version (if you don’t need the extensibility, have a single variable to process, etc.) would look like: The list of accepted environment variables on SSHD by default includes LC_*. Thus: It is also possible to pass environment variables explicitly through ssh.

How to pass quotes to a remote host?

You need a second set of quotes so that the first set of single quotes is passed through to the remote host. As you can see, the quotes start to get unwieldy. A better solution is to simply copy a script containing to the remote host and execute that remotely.

Can you pass variables to a remote script?

This works fine and on the remote server, the variables MYVAR1 and MYVAR2 are available with their corresponding value. The issue is that these scripts are in constant development which requires the SSH command to be changed every-time a variable is renamed, added, or removed.

How to expand a variable in a shell?

Use double quotes: The shell will expand variables in double-quotes, but not in single-quotes. This will change into your desired string before being passed to the ssh command. (This answer might seem needlessly complicated, but it’s easily extensible and robust regarding whitespace and special characters, as far as I know.)

Where to find the environment variable in SSH _ config?

You can’t give a specific value for an environment variable in ssh_config, but you can certainly send the existing environment variable only to specific hosts. To complete the chain: Finally, the remote server must have the environment variable listed in AcceptEnv in its sshd_config.

How to give a specific value in SSH?

You can give a specific value by using SetEnv in your ~/.ssh/config, e.g. Host * SetEnv FOO=bar As per man ssh_config: Directly specify one or more environment variables and their contents to be sent to the server.

Do you explicitly invoke the shell in SSH?

It’s better to explicitly invoke the shell to avoid surprises ( ssh host csh also means a tty is not requested so you don’t need -T ). Note the $LC_parameter:q syntax, which is the csh way to pass the content of a variable verbatim, not “$LC_parameter” which doesn’t work if the variable contains newline characters.

Is it safe to accept a variable in SSH?

Accepting any variable is a big security risk so is generally not done by default, though some ssh deployments allow some variables under some namespace (like LC_* in some OpenSSH deployments).