nagios内存监测脚本

#!/bin/sh
#
# Script to check memory usage on Linux. Ignores memory used by disk cache.
#
#
#
print_help() {
echo "Usage:"
echo "[-w] Warning level as a percentage"
echo "[-c] Critical level as a percentage"
exit 0
}
while test -n "$1"; do
case "$1" in
--help|-h)
print_help
exit 0
;;
-w)
warn_level=$2
shift
;;
-c)
critical_level=$2
shift
;;
*)
echo "Unknown Argument: $1"
print_help
exit 3
;;
esac
shift
done
if [ "$warn_level" == "" ]; then
echo "No Warning Level Specified"
print_help
exit 3;
fi
if [ "$critical_level" == "" ]; then
echo "No Critical Level Specified"
print_help
exit 3;
fi
free=`free -m | grep "buffers/cache" | awk '{print $4}'`
used=` free -m | grep "buffers/cache" | awk '{print $3}'`
total=$(($free+$used))
result=$(echo "$used / $total * 100" |bc -l|cut -d . -f1)
if [ "$result" -lt "$warn_level" ]; then
echo "Memory OK. $result% used."
exit 0;
elif [ "$result" -ge "$warn_level" ] && [ "$result" -le "$critical_level" ]; then
echo "Memory WARNING. $result% used."
exit 1;
elif [ "$result" -gt "$critical_level" ]; then
echo "Memory CRITICAL. $result% used."
exit 2;
fi