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#!/bin/bash
if [ $# -ne 2 ]; then
cat << EOF
Check memory usage. Values: used%
USAGE: $0 <WARN> <CRIT>
Note: USED=TOTAL-AVAILABLE
EOF
exit 3
fi
WARN=$1
CRIT=$2
if ! which free > /dev/null; then
echo UNKNOWN: free command not found.
exit 3
fi
TOTAL=0
USED=0
AVAIL=0
while read line; do
ARR=( $line )
[ ${ARR[0]} != "Mem:" ] && continue
TOTAL=${ARR[1]}
AVAIL=${ARR[6]}
USED=$(($TOTAL-$AVAIL))
break
done <<< $(free | tail -n -2)
PERCENT_USED=$(echo "scale=2; $USED / $TOTAL * 100 / 1" | bc -l)
PERCENT_USED=${PERCENT_USED%.*}
if [ $PERCENT_USED -ge $CRIT ]; then
RET=2
echo -n "Memory CRITICAL: "
elif [ $PERCENT_USED -ge $WARN ]; then
RET=1
echo -n "Memory WARNING: "
else
RET=0
echo -n "Memory OK: "
fi
echo "$PERCENT_USED% Used | percent_used=$PERCENT_USED% total=$TOTAL available=$AVAIL"
exit $RET
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