SSH then change Shell

bash login ssh solaris csh
user2511875 picture user2511875 · Jul 28, 2014 · Viewed 25.8k times · Source

Potentially a real easy question but I was wondering if anybody can kindly provide some advice.

To accomplish a repeating task, I am constantly logging into a remote Solaris server using credentials given to us from our system admin. However, each time I log in, I must change shell (from csh -> bash) as the specific task must be run using BASH.

Although it is not a major problem doing this, I find the changing to bash shell somewhat tedious as I must repeat this task several times a day, and also occasionally may forget to change shells before running the task, etc (also I prefer BASH too so).

Is there a way where I can ssh and change default shell in one line so I can start immediately with the script I want on the remote server? Note, I do not what to change any log in files (like .login or .cshrc) as the remote server & the credentials are shared an not specifically for me. I don't want to change the default shell either on the server either as, again, the server & the credentials are used by several people.

Would anybody have any ideas how to get around such a problem? Any suggestions would be greatly appreciated.

Answer

Beggarman picture Beggarman · Jul 28, 2014

SSH usually executes the command you pass it as an argument and then disconnects. You'll need three options set to get your interactive session to work:

  • ssh -t will force the pseudo-tty allocation necessary for you to interact with the remote command you're asking SSH to run
  • bash -l will start an interactive login shell
  • csh -l -c will start an interactive login shell in csh, and then execute the command that follows

To just launch a different shell (i.e., your default is csh, and you want to launch bash):

ssh -t <user>@<server> "bash -l"

To pickup the csh environment first, we start the interactive shell, and then pass the command to switch to bash:

ssh -t <user>@<server> 'csh -l -c "bash"'

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