def list(options)
      file = File.open(FILE_PATH, 'a+')
      servers = all_hosts_in(file)
      file.close
      if servers.empty?
        PRINTER.print 'No aliases added'
      else
        PRINTER.print 'Listing aliases:'
        servers.each{|x| PRINTER.print "\t- #{x}"}
      end
      finish_exec
    end
def list(options)
      file = File.open(FILE_PATH, 'a+')
      servers = all_hosts_in(file)
      file.close
      if servers.empty?
        PRINTER.print 'No aliases added'
      else
        PRINTER.print 'Listing aliases:'
        servers.each{|x| PRINTER.print "\t- #{x}"}
      end
      finish_exec
    end
remove_alias_name(alias_name, file, new_file)

 lists the aliases available in the config file