usage: ppscheck [OPTIONS] <device>

  --help            Show this help, then exit.
  --pps             List pps devices active.
  --seconds SEC     Exit after SEC seconds delay.
  --version         Show version, then exit.
   -?               Show this help, then exit.
   -h               Show this help, then exit.
   -m               Find pps device that matches <device>
   -p               List pps devices active.
   -V               Show version, then exit.
   -x SEC           Exit after SEC seconds delay.

   <device>         Device to check (/dev/ttyS0, /dev/pps0, etc.).