How do you execute a command on a remote system insde a BASH script?

Question

As part of an intricate BASH script, I'd like to execute a command on a remote system from within the script itself.

Right now, I run the script which tailors files for the remote system and uploads them, then through a ssh login I execute a single command.

So for full marks:

• How do I log into the remote system from the bash script (i.e. pass the credentials in non-interactively)?
• How can I execute a command (specifically "chmod 755 /go && /go") from within the script?

Answer 1

Set up SSH key pairs and just run the command like:

ssh user@host 'command'

There are, of course other interconnects available, but few portable.

Answer 2

Following tinkertim's answer:

Setup public keys and then you can do the following:

#!/bin/bash
ssh user@host "chmod 755 /go && /go"

Answer 3

Not really a direct answer to the question, but ...

You might want to have a look at Capistrano. Capistrano is developped to help you run commands on multiple machines. It might be too specialized for your needs ... but who knows ...