new_contents: import boto
  import datetime
  
  from boto.dynamodb2.table import Table
  from boto.dynamodb2.table import HashKey
  from boto.dynamodb2.layer1 import DynamoDBConnection
  
  class CommandListKnownArchivesForVault(object):
  
    def execute(self, args, config):
      glacier_connection = boto.connect_glacier(aws_access_key_id=config.get('configuration', 'aws_key'), aws_secret_access_key=config.get('configuration', 'aws_secret'))
  
      try:
        vault = glacier_connection.get_vault(args[5])
      except:
        vault = None
  
      if vault is None:
        print "Vault named '{}' does not exist.".format(args[5])
      else:
        dynamo_connection = DynamoDBConnection(aws_access_key_id=config.get('configuration', 'aws_key'), aws_secret_access_key=config.get('configuration', 'aws_secret'))
        archive_id_table = Table(config.get('configuration', 'dynamodb_table'), connection=dynamo_connection, schema=[HashKey('Account ID')])
  
        count = 1
        for archive in archive_id_table.scan():
          time_str = datetime.datetime.fromtimestamp(archive['Upload Timestamp']).strftime('%d, %b %Y')
          print "{}.\tFilename: {}\n\tTimestamp: {}\n\tArchive ID: {}".format(count, archive['Filename'], time_str, archive['Archive ID'])
          count += 1
  
    def accept(self, args):
      return len(args) >= 6 and args[0] == 'list' and args[1] == 'known' and args[2] == 'archives' and args[3] == 'for' and args[4] == 'vault'
  
    def help(self):
      return "list known archives for vault <vault name>"
  
  def command_init():
    return CommandListKnownArchivesForVault()
  
subject: Add list known archives command