ruby - How to SSH into a server and then SFTP from there to another server? -

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here's situation:

i have ssh access servera

i have sftp access serverb, servera

i want use ruby ssh servera, sftp files serverb servera.

i can connect servera using documentation net::ssh:

require 'net/ssh/gateway'  gateway = net::ssh::gateway.new('server_a', 'user')  gateway.ssh("server_a", "user") |ssh|   # how sftp server_b here , run sftp commands? end  gateway.shutdown!

what can't figure out how sftp serverb context of servera?

assuming have private keys setup, run:

$ ssh-add

and write this:

require 'net/ssh'  # set :forward_agent => true automatically authenticate server_b net::ssh.start('server_a', 'user', :forward_agent => true) |ssh|   puts ssh.exec!("scp -r server_b:dir_i_want_to_copy dir_to_copy_to/") end

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