Bash Help

Asung · 03-25-2016, 03:53 AM

Hi all

Wasn't sure exactly were to post this as I couldn't see a scripting section?
Anyway I have created a bash script which logs me via ssh automatically. I then want it to perform further commands after login, however I cannot get this to work. I am connect to my linux server via a Mac OS X.

Please see script below any help is appreciated

#!/usr/bin/expect -f
spawn ssh root@192.168.0.40
expect "password:"
send "password here"
interact
sleep 2
send "service tor start"
send "service tor status"
end

wpeckham · 03-25-2016, 05:02 AM

Quote:

Originally Posted by Asung

Hi all

Wasn't sure exactly were to post this as I couldn't see a scripting section?
Anyway I have created a bash script which logs me via ssh automatically. I then want it to perform further commands after login, however I cannot get this to work. I am connect to my linux server via a Mac OS X.

Please see script below any help is appreciated

#!/usr/bin/expect -f
spawn ssh root@192.168.0.40
expect "password:"
send "password here"
interact
sleep 2
send "service tor start"
send "service tor status"
end

Can you tell me why you are using expect?
FWIW, this would not really be a bash question, more of an expect quesxtion or an OpenSSH question.

The normal and supported way to automate ssh logon is to use certificates, rather than expect. Is there some reason you are not using certificates to automate logon?

Asung · 03-25-2016, 11:54 AM

Quote:

Originally Posted by wpeckham

Can you tell me why you are using expect?
FWIW, this would not really be a bash question, more of an expect quesxtion or an OpenSSH question.

The normal and supported way to automate ssh logon is to use certificates, rather than expect. Is there some reason you are not using certificates to automate logon?

Thanks for you reply.
Im not very good at scripting yet.
I copied the script from another forum online and modified it to my liking.
Is there a better way to do it?

The cert is already installed on my machine. The script will connect me to the SSH session with no problem at all.
Its the commands after e.g. service tor start

wpeckham · 03-26-2016, 06:44 AM

Forgive me, I did not make myself clear. Your expect script detects and responds to a password prompt. If your personal public cert were installed on the remote host there would be no password prompt.

You could run a command like

Code:

 ssh root@192.168.0.40 uptime

and see the output of the command appear on the next line of your local terminal.

Once that works, you could do something like

Code:

 ssh root@192.168.0.40 -t "command 1;command 2;bash"

to run the two commands and then remain in session on the remote host. Check the man page for ssh, and google for examples. It is easier than you think.