script usage

Usage:
      generate_creds.py init
      generate_creds.py show-roles <account>
      generate_creds.py generate [--duration=<sec>] [--log-level=<set>] [--account=<name>]
                                [--access=<level>] [--username=<user>] [--non-interactive]
                                [--dry-run]
      generate_creds.py refresh  [--dry-run]
      generate_creds.py switch   [--account=<name>] [--non-interactive] [--dry-run]
      generate_creds.py (-h | --help)
      generate_creds.py --version
    Commands:
       init              Create a new credentials file from some raw input values.
       show-roles        Show list of roles. Specify 'all' to see list of all roles for all accounts.
                         Specify account name 'pnb-stage' to see only roles for this account
       generate          Generate STS credentials in interactive mode
       refresh           Refresh last used credentials
       switch            If you want to switch between account without changing username and access level
    Options:
      -h --help             Show this screen.
      --account=<name>      AWS account to generate STS credentials.
                            Could provided via the environment variable 'AWS_ACCOUNT_NAME'.
      --username=<user>     Username that you use in AWS 'firstname.lastname'.
                            Could provided via the environment variable 'AWS_USER_NAME'.
      --access=<level>      Level of access (developer|superuser|readonly) [default: developer].
      --duration=<sec>      The duration, in seconds, that the
                            temporary credentials should remain valid.
                            Could provided via the environment variable 'MFA_STS_DURATION'
                            [default: 3600].
      --non-interactive     Generate credentials without interactive mode using command line options
                            or ENV variables.
      --dry-run             List all values to stdout without changing credentials file
      --log-level=<set>     Set log level. 'CRITICAL', 'ERROR', 'WARNING',
                            'INFO', 'DEBUG', 'NOTSET' [default: DEBUG].