st_hosts.rb

require 'pry'
require 'pp'
require 'yaml'
require 'net/netconf/jnpr'
require 'junos-ez/stdlib'

# login information for NETCONF session 

login = { :target => ARGV[0], :username => 'jeremy',  :password => 'jeremy1',  }

## create a NETCONF object to manage the device and open the connection ...

ndev = Netconf::SSH.new( login )
$stdout.print "Connecting to device #{login[:target]} ... "
ndev.open
$stdout.puts "OK!"

## Now bind providers to the device object.
## the 'Junos::Ez::Provider' must be first before all others
## this provider will setup the device 'facts'.  The other providers
## allow you to define the instance variables; so this example
## is using 'l1_ports' and 'ip_ports', but you could name them
## what you like, yo!

Junos::Ez::Provider( ndev )
Junos::Ez::StaticHosts::Provider( ndev, :hosts )

pp ndev.hosts.list
pp ndev.hosts.catalog

binding.pry

ndev.close