check_mem_ucd_snmp: nagios-check testing the memory of a linux-system via SNMP

see http://www.intra2net.com/en/developer/monitoring/
for current version, documentation, contact information etc.

This nagios plugin is free software, and comes with ABSOLUTELY
NO WARRANTY. It may be used, redistributed and/or modified under
the terms of the GNU General Public Licence; either version 2
of the License, or (at your option) any later version.

Usage: check_mem_ucd_snmp [-h|--help] -H <hostname> [-p <port>] [-t <timeout>] [-T <retries>] [-v] [-i (KB|MB|GB)]
[-1 | -2] [-c <community>]
[-3] [-u <username>] [-a (md5|sha)] [-A <authpasswd>] [-x (des|aes)] [-X <privpasswd>]
     [-E <contextengineid>] [-n <contextname>]
[-m <total-threshold>] [-M <total-threshold>] [-r <real-threshold>] [-R <real-threshold>]

 -?, --usage
   Print usage information
 -h, --help
   Print detailed help screen
 -V, --version
   Print version information
 --extra-opts=[<section>[@<config_file>]]
   Section and/or config_file from which to load extra options (may repeat)
 -H, --hostname=STRING
   hostname or IP
 -p, --port=INTEGER
   portnumber
 -T, --retries=INTEGER
   SNMP retries on error, default: 1
 -i, --unit=STRING
   unit for output and thresholds (KB|MB|GB), default: MB
 -1, --snmpv1
   use SNMP version 1
 -2, --snmpv2c
   use SNMP version 2c
 -c, --community=STRING
   SNMPv1/SNMPv2c community name, default: public
 -3, --snmpv3
   use SNMP version 3
 -u, --username=STRING
   SNMPv3 username
 -a, --authprotocol=STRING
   SNMPv3 authentication protocol (md5|sha), default: md5
 -A, --authpassword=STRING
   SNMPv3 authentication password
 -x, --privprotocol=STRING
   SNMPv3 privacy protocol (des|aes), default: des
 -X, --privpassword=STRING
   SNMPv3 privacy password
 -E, --contextengineid=STRING
   SNMPv3 context engine ID
 -n, --contextname=STRING
   SNMPv3 context name
 -m, --totalavail-warning=FLOAT:FLOAT
   Warning threshold for the total memory (real+swap) available, default: 500:
 -M, --totalavail-critical=FLOAT:FLOAT
   Critical threshold for the total memory (real+swap) available, default: 200:
 -r, --realavail-warning=FLOAT:FLOAT
   Warning threshold for the real memory available (free+buffer+cache), default: 200:
 -R, --realavail-critical=FLOAT:FLOAT
   Critical threshold for the real memory available (free+buffer+cache), default: 50:
 -t, --timeout=INTEGER
   Seconds before plugin times out (default: 15)
 -v, --verbose
   Show details for command-line debugging (can repeat up to 3 times)

All thresholds are in nagios standard format, see
http://nagiosplug.sourceforge.net/developer-guidelines.html#THRESHOLDFORMAT
for a description

This check does currently not support setting the security engine id.