old_contents: """
  Command line entry point.
  """
  from argparse import ArgumentParser
  from os import environ
  from pipes import quote
  from sys import argv
  
  from awsenv.cache import CachedSession, DEFAULT_SESSION_DURATION
  from awsenv.profile import AWSProfile
  
  
  def parse_args(args):
      """
      Select the AWS profile to use.
  
      Defaults to the value of the `AWS_PROFILE` environment variable but
      allows overriding by command line arguments.
      """
      profile = environ.get("AWS_PROFILE", environ.get("AWS_DEFAULT_PROFILE", "default"))
  
      parser = ArgumentParser()
      parser.add_argument(
          "profile",
          nargs="?",
          default=profile,
      )
      parser.add_argument(
          "--session-duration",
          type=int,
          default=DEFAULT_SESSION_DURATION,
      )
      args = parser.parse_args(args)
      return args
  
  
  def to_environment(variables):
      """
      Print environment variables for a profile.
      """
      return "\n".join(
          "unset {};".format(key) if value is None else "export {}={}".format(key, quote(value))
          for key, value in variables.items()
      )
  
  
  def main():
      args = parse_args(argv)
      cached_session = CachedSession.from_environment(
          session_duration=args.session_duration,
      )
      aws_profile = AWSProfile(
          profile=args.profile,
          session_duration=args.session_duration,
          cached_session=cached_session,
      )
      aws_profile.update_credentials()
      print to_environment(aws_profile.to_envvars())  # noqa
  
new_contents: """
  Command line entry point.
  """
  from argparse import ArgumentParser
  from os import environ
  from pipes import quote
  from sys import argv
  
  from awsenv.cache import CachedSession, DEFAULT_SESSION_DURATION
  from awsenv.profile import AWSProfile
  
  
  def parse_args(args):
      """
      Select the AWS profile to use.
  
      Defaults to the value of the `AWS_PROFILE` environment variable but
      allows overriding by command line arguments.
      """
      profile = environ.get("AWS_PROFILE", environ.get("AWS_DEFAULT_PROFILE", "default"))
  
      parser = ArgumentParser()
      parser.add_argument(
          "profile",
          nargs="?",
          default=profile,
      )
      parser.add_argument(
          "--session-duration",
          type=int,
          default=DEFAULT_SESSION_DURATION,
      )
      args = parser.parse_args(args)
      return args
  
  
  def to_environment(variables):
      """
      Print environment variables for a profile.
      """
      return "\n".join(
          "unset {};".format(key) if value is None else "export {}={}".format(key, quote(value))
          for key, value in variables.items()
      )
  
  
  def main():
      args = parse_args(argv[1:])
      cached_session = CachedSession.from_environment(
          session_duration=args.session_duration,
      )
      aws_profile = AWSProfile(
          profile=args.profile,
          session_duration=args.session_duration,
          cached_session=cached_session,
      )
      aws_profile.update_credentials()
      print to_environment(aws_profile.to_envvars())  # noqa
  
subject: Add READMe.md