From: Caveman <dwstorie@...>
Date: 2007-05-11T04:50:10+09:00
Subject: Re: Net::SSH exec command on remote host

Saga,

There are many ways to execute commands via the NET::SSH.  Here is one
option that will do what you want it to do:


This encapsulates the commands:
Net::SSH.start(h,u,p) do |session|
  shell = session.shell.sync
    cmd = shell.send_command "whatevercommand\n"
    p cmd.stdout
    cmd2 = shell.send_command "whatevercommand\n"
    p cmd2.stdout
  end
end

Or, if it's a standard command, you can do this:
Net::SSH.start(h,u,p) do |session|
  shell = session.shell.sync
    cmd = shell.whatevercommand
    p cmd.stdout
    cmd2 = shell.whatevercommand
    p cmd2.stdout
  end
end

Cool thing about this is, if you are running a command that pipes to
stderr, you can also capture that with cmd.stderr.

Using the shell.send_command method allows you to send entire strings
to be executed, such as:

cmd = shell.send_command("cat /proc/partitions")
p cmd.stdout

Which allows you to capture the stdout as a string, then parse it as
such:

cmd = shell.send_command("cat /proc/partitions")
devices = out.stdout
devices.gsub!(/\n/,'')
devices.gsub!(/([0123456789])/, '')
disks<<devices.scan(%r/ (.*) /)
puts disks.uniq!

Which "should" give you a list of all unique mounted drives in your
system... just as an example.

Hope this helps,
Caveman