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[root@localhost libexec]# ./check_disk --help
check_disk v2.0.3 (nagios-plugins 2.0.3)
Copyright (c) 1999 Ethan Galstad <nagios@nagios.org>
Copyright (c) 1999-2014 Nagios Plugin Development Team
<devel@nagios-plugins.org>
This plugin checks the amount of used disk space on a mounted file system
and generates an alert if free space is less than one of the threshold values
check_disk is monitoring free space, not used space. If the value of free space is LESS THAN the threshold you set, that's when things are bad. Make sense?