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Editorial Team
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Asked: 2026-05-26T10:41:40+00:00

I am trying to use the Net::SSH library to login and manage a host

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I am trying to use the Net::SSH library to login and manage a host that supports ssh. It is a piece of telecom equipment and so speaks TL1. I seem to be able to log in successfully, but when I try to ssh.exec something, it aborts saying it could not execute command. Here is my simple code:

require 'net/ssh'

Net::SSH.start('10.204.121.192', 'password', :password => "password") do |ssh|
  ssh.exec("INH-MSG-ALL;")
end

If i point the same code at a Linux server and provide a command such as “ls -l /”, it works fine. What I am wondering is, can I use this ssh library? Do I need to use another command instead of exec?

This is the error output:

/usr/local/rvm/gems/ruby-1.9.2-p290/gems/net-ssh-2.2.1/lib/net/ssh/connection/session.rb:322:in `block (2 levels) in exec': could not execute command: "INH-MSG-ALL;" (RuntimeError)
from /usr/local/rvm/gems/ruby-1.9.2-p290/gems/net-ssh-2.2.1/lib/net/ssh/connection/channel.rb:597:in `call'
from /usr/local/rvm/gems/ruby-1.9.2-p290/gems/net-ssh-2.2.1/lib/net/ssh/connection/channel.rb:597:in `do_failure'
from /usr/local/rvm/gems/ruby-1.9.2-p290/gems/net-ssh-2.2.1/lib/net/ssh/connection/session.rb:586:in `channel_failure'
from /usr/local/rvm/gems/ruby-1.9.2-p290/gems/net-ssh-2.2.1/lib/net/ssh/connection/session.rb:456:in `dispatch_incoming_packets'
from /usr/local/rvm/gems/ruby-1.9.2-p290/gems/net-ssh-2.2.1/lib/net/ssh/connection/session.rb:213:in `preprocess'
from /usr/local/rvm/gems/ruby-1.9.2-p290/gems/net-ssh-2.2.1/lib/net/ssh/connection/session.rb:197:in `process'
from /usr/local/rvm/gems/ruby-1.9.2-p290/gems/net-ssh-2.2.1/lib/net/ssh/connection/session.rb:161:in `block in loop'
from /usr/local/rvm/gems/ruby-1.9.2-p290/gems/net-ssh-2.2.1/lib/net/ssh/connection/session.rb:161:in `loop'
from /usr/local/rvm/gems/ruby-1.9.2-p290/gems/net-ssh-2.2.1/lib/net/ssh/connection/session.rb:161:in `loop'
from /usr/local/rvm/gems/ruby-1.9.2-p290/gems/net-ssh-2.2.1/lib/net/ssh/connection/session.rb:110:in `close'
from /usr/local/rvm/gems/ruby-1.9.2-p290/gems/net-ssh-2.2.1/lib/net/ssh.rb:194:in `start'
from ssh_test.rb:3:in `<main>'
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1 Answer

  1. Editorial Team

    I assume it works fine when you login in the shell manually.

    To understand what is the difference when you connect through net/ssh collect output of env command in both cases and compare.

    That most probably you’ll see a difference that will lead you to a solution or at least will give you dirty trick.

    UPDATE. (Not working)

    Net::SSH.start('10.204.121.192', 'password', :password => "password") do |ssh|
   ssh.open_channel do |channel|
        channel.on_data do |ch, data|
          puts "got data: #{data.inspect}"
        end
        channel.send_data("INH-MSG-ALL;\n")
   end
end

    UPDATE2. (Working)

    Net::SSH.start('10.204.121.192', 'password', :password => "password") do |ssh|
   ssh.open_channel do |channel|
        channel.send_channel_request "shell"
        channel.on_data do |ch, data|
          puts "got data: #{data.inspect}"
        end
        channel.send_data("INH-MSG-ALL;\n")
   end
end
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