Bashscripts.org

#!/bin/sh
#http://www.ibm.com/developerworks/aix/library/au-satdiskmon.html#N10278

warninglimit=500000
lowlimit=250000

filesystems="/export/data /export/home /"

for fs in $filesystems
do
        size=`df -k $fs|grep $fs|awk '{ print $4; }'`
        if [ $size -le $lowlimit ]
        then
                mailx -s "URGENT: Low disk space for $fs ($size)"
                break
        fi
        if [ $size -le $warninglimit ]
        then
                mailx -s "WARNING: Low disk space for $fs ($size)"
        fi

        df -k $fs|grep $fs|awk '{ print $3; }' >> $wdir/$fs.udisksp.log
        #df -k "/dev/sda5"|grep "/dev/sda5"|awk '{ print $3; }'
        echo ${"/dev/part1"//"/"/"_"}

done

echo "${fs//\//_}"

LANG=C man -P"less -ip 'Parameter Expansion'" bash