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#!/bin/bash
root=`df -m | grep /dev/disk3s2 | sed -E 's/[[:space:]]+/ /g' | cut -d ' ' -f 4`
fs=`df -m | grep /dev/disk2 | sed -E 's/[[:space:]]+/ /g' | cut -d ' ' -f 4`
cpu=`uptime | sed -E "s/[[:space:]]+/ /g" | tr ' ' '\n' | tail -n 1`
mem=`top -l 1 | grep PhysMem | sed -E "s/[[:space:]]+/ /g"`
cache=`echo $mem | cut -f 6 -d ' '`
free=`echo $mem | cut -f 10 -d ' '`
len=`echo $cache | wc -c`
len=`expr $len - 1`
units=`echo $cache | cut -c $len`
len=`expr $len - 1`
size=`echo $cache | cut -c -$len`
if [ $units == "G" ]; then
size=`expr $size '*' 1024`
elif [ $units != "M" ]; then
size=0
fi
len=`echo $free | wc -c`
len=`expr $len - 1`
units=`echo $free | cut -c $len`
len=`expr $len - 1`
fsize=`echo $free | cut -c -$len`
if [ $units == "G" ]; then
size=`expr $fsize '*' 1024 + $size`
elif [ $units == "M" ]; then
size=`expr $fsize + $size`
fi
mem=$size
if [ $root -le 8192 ]; then
echo "Only $(($root / 1024)) GB left in the root file system"
fi
if [ $fs -le 102400 ]; then
echo "Only $(($fs / 1024)) GB left in the PDV file system"
fi
if [ $mem -le 512 ]; then
echo "The system is starving on memory, $mem MB left free"
fi
if [ `echo "$cpu < 7.80" | bc` -eq 0 ]; then
echo "The system is starving on cpu, $cpu is load average for the last 15 min"
fi
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