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+#########################################################################
+# Script:       check_zpools.sh
+# Purpose:      Nagios plugin to monitor status of zfs pool
+# Authors:      Aldo Fabi             First version (2006-09-01)
+#               Vitaliy Gladkevitch   Forked (2013-02-04)
+#               Claudio Kuenzler      Complete redo, perfdata, etc (2013-2014)
+# Doc:          http://www.claudiokuenzler.com/nagios-plugins/check_zpools.php
+# History:
+# 2006-09-01    Original first version
+# 2006-10-04    Updated (no change history known)
+# 2013-02-04    Forked and released
+# 2013-05-08    Make plugin work on different OS, pepp up plugin
+# 2013-05-09    Bugfix in exit code handling
+# 2013-05-10    Removed old exit vars (not used anymore)
+# 2013-05-21    Added performance data (percentage used)
+# 2013-07-11    Bugfix in zpool health check
+# 2014-02-10    Bugfix in threshold comparison
+# 2014-03-11    Allow plugin to run without enforced thresholds
+#########################################################################