#script to check real memory usage

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# Miracle 2013/12/23 - V.1.0

# ------------------------------------------

# ########  Script Modifications  ##########

# ------------------------------------------

# Who         When           What

# ---    ----      ----

# Miracle         2013/12/23  "$percent" lt 1% fix - sed edits dc result beggining with "."

#

#

#!/bin/bash

USAGE="`basename $0` [-w|--warning] [-c|--critical]"

THRESHOLD_USAGE="WARNING threshold must be greater than CRITICAL: `basename $0` $*"

calc=/tmp/memcalc

percent_free=/tmp/mempercent

critical=""

warning=""

STATE_OK=0

STATE_WARNING=1

STATE_CRITICAL=2

STATE_UNKNOWN=3

# print usage

if [[ $# -lt 4 ]]

then

       echo ""

       echo "Wrong Syntax: `basename $0` $*"

       echo ""

       echo "Usage: $USAGE"

       echo ""

       exit 0

fi

# read input

while [[ $# -gt 0 ]]

 do

       case "$1" in

              -w|--warning)

              shift

              warning=$1

       ;;

              -c|--critical)

              shift

              critical=$1

       ;;

       esac

       shift

 done

# verify input

if [[ $warning -eq $critical || $warning -lt $critical ]]

then

       echo ""

       echo "$THRESHOLD_USAGE"

       echo ""

       echo "Usage: $USAGE"

       echo ""

       exit 0

fi

# Total memory available

total=`free -m | head -2 |tail -1 |gawk '{print $2}'`

# Total memory used

used=`free -m | head -2 |tail -1 |gawk '{print $3}'`

# Calc total minus used

free=`free -m | head -2 |tail -1 |gawk '{print $4}'`

# normal values

#echo "$total"MB total

#echo "$used"MB used

#echo "$free"MB free

# make it into % percent free = ((free mem / total mem) * 100)

echo "5" > $calc # decimal accuracy

echo "k" >> $calc # commit

echo "100" >> $calc # multiply

echo "$free" >> $calc # division integer

echo "$total" >> $calc # division integer

echo "/" >> $calc # division sign

echo "*" >> $calc # multiplication sign

echo "p" >> $calc # print

percent=`/usr/bin/dc $calc|/bin/sed 's/^\./0./'|/usr/bin/tr "." " "|/usr/bin/gawk {'print $1'}`

#percent1=`/usr/bin/dc $calc`

#echo "$percent1"

if [[ "$percent" -le  $critical ]]

       then

               echo "CRITICAL - $free MB ($percent%) Free Memory"

               exit 2

fi

if [[ "$percent" -le  $warning ]]

       then

               echo "WARNING - $free MB ($percent%) Free Memory"

               exit 1

fi

if [[ "$percent" -gt  $warning ]]

       then

               echo "OK - $free MB ($percent%) Free Memory"

               exit 0

fi

文章题目：nagios下配置监控系统内存的使用情况的脚本，带预警功能
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