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#!/bin/bash
totalmem=`free -b | awk '/^Mem/ {print $2}'`
usedmem=`free -b | awk '/^Mem/ {print $3}'`
warning=$(($totalmem*85/100))
critical=$(($totalmem*95/100))
pct=$(( $usedmem * 100 / $totalmem ))
PerfData="'mem-used'=$usedmem;$warning;$critical; 'pct_used'=$pct;;;"
if [[ $usedmem -lt $warning ]]; then
echo "OK - memory usage = $usedmem KB | $PerfData"
exit 0
fi
if [[ $usedmem -ge $warning ]] && [[ $usedmem -lt $critical ]]; then
echo "WARNING - memory usage = $usedmem KB | $PerfData"
exit 2
fi
if [[ $usedmem -ge $critical ]] ; then
echo "CRITICAL - memory usage = $usedmem KB | $PerfData"
exit 1
fi