$ vcsapeek --help
usage: vcsapeek [-h] [-f FORMAT] [DEVICE]

positional arguments:
  DEVICE                device to peek into; either /dev/ttyN or /dev/vcsaN

options:
  -h, --help            show this help message and exit
  -f FORMAT, --format FORMAT
                        output format: 'text' or 'ansi' or 'xhtml'