Shell Programming and Scripting

#! /usr/bin/ksh

### 
### This script can be run from cron to periodically check 
### filesystems for low disk space and send an e-mail.
###
###  Variables: 
###     MAXSIZE = percentage filesystem must be full before notification
###     NOTIFY = email address to notify when file system reaches MAXSIZE
###

### Configurable variables here
MAXSIZE=90
NOTIFY=xxx@domain.com
HOSTNAME=`hostname`

# Add filesystems you wish to skip from checking
FSLIST=`df -k | grep -v "cdrom" | grep -v "mnt"  | awk '{ \
                fssize=substr($5,1,index($5,"%")-1)
                if (int(fssize) > int(maxsize)) {
                        print $6":"fssize
                }
        }' maxsize=$MAXSIZE`

### Were there any fs to report?
if [ -z $FSLIST ]; then
	echo "There were no reportable filesystems."
	exit 0
fi

### Mail out the list if there is one
for fs in $FSLIST
do
        FS=`echo $fs | cut -f1 -d:`
        SIZE=`echo $fs | cut -f2 -d:`
        MESSAGE="Subject: $HOSTNAME File System Alert: $FS at $SIZE %"
        echo $MESSAGE | mail $NOTIFY
done	

### Exit gracefully
exit 0

if [ -z $FSLIST ]; then

if [ -z "$FSLIST" ]; then

#! /usr/bin/ksh -x

#!/usr/bin/ksh
 
set -x

0 8 1-5 * * /path/to/script > /dev/null 2>&1