usage: low-disk-check.py [-h] [--used percent] [--warn-days days]

Print alert if disk space is low.

optional arguments:
  -h, --help        show this help message and exit
  --used percent    Print warning if used% >= this (default: 90)
  --warn-days days  Only warn if last warning was older than this many days (default: 7)

Copyright 2019-2020  John Begenisich

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <https://www.gnu.org/licenses/>.