How to ssh from within a bash script

Question

I am trying to create an ssh connection and do some things on the remote server from within the script   However the terminal prompts me for a password  then opens the connection in the terminal window instead of the script  The commands don t get executed until I exit the connection   How can I ssh from within a bash script

User · Answer

If you want to continue to use passwords and not use key exchange then you can accomplish this with  expect  like so      usr bin expect -f spawn ssh user hostname expect  password   sleep 1 send   lt your password gt  r  command1 command2 commandN

User · Answer

If you want the password prompt to go away then use key based authentication  described here   To run commands remotely over ssh you have to give them as an argument to ssh  like the following       root host     ssh root www  ps -ef   grep apache   grep -v grep   wc -l

User · Answer

There s yet another way to do it using Shared Connections  ie  somebody initiates the connection  using a password  and every subsequent connection will multiplex over the same channel  negating the need for re-authentication    And its faster too         ssh config  ControlMaster auto ControlPath    ssh pool  r  h   then you just have to log in  and as long as you are logged in  the bash script will be able to open ssh connections    You can then stop your script from working when somebody has not already opened the channel by   ssh     -o KbdInteractiveAuthentication no

User · Answer

What you need to do is to exchange the SSH keys for the user the script runs as  Have a look at this tutorial  After doing so  your scripts will run without the need for entering a password  But  for security s sake  you don t want to do this for root users

[bash] How to ssh from within a bash script?

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