diskcheck.sh

#!/bin/sh
# Maintained at: git@github.com:dareni/shellscripts.git
# Send a mail to root when the disk usage passes a threshold.
# Usage: diskcheck.sh [filesystem] [threshold%]
# Usage: diskcheck.sh [filesystem1:filesystem2] [threshold%]

if [ -z "$1" ]; then
    FS="/"
else
    FS="$1"
fi

if [ -z "$2" ]; then
    THRESHOLD=98
else
    THRESHOLD=$2
fi

CAP_MSG=""
for FSYS in `echo $FS  |sed 's/:/ /g'`
do
    CAPACITY=`df ${FSYS} | awk '{ if (NR == 2) print $5}' |sed 's/%//'`
    if [ ${CAPACITY} -ge ${THRESHOLD} ]; then
        CAP_MSG="${CAP_MSG}    $FSYS"
        LEN=$((30-${#FSYS}))
        CAP_MSG="${CAP_MSG}`printf '%*.*s usage:' 0  $LEN "   ....................................."`"
        CAP_MSG="${CAP_MSG} $CAPACITY%\n"
    fi
done;

if [ -n "$CAP_MSG" ]; then
    printf 'WARNING: %s filesystem usage threshold %s exceeded!\n%b' `hostname` ${THRESHOLD} "${CAP_MSG}" | mail -s "`hostname` filesystem usage threshold ${THRESHOLD}% exceeded." root 
fi;