Linux shell script to check /var logs space and send email if used space reach 80%. Also print space usage of each directory inside /var. Useful to find out which folder use most of space under /var. This script really helps system administrator to monitor their servers space usage. Based on the requirement , administrators can change the directoires they want to monitor.
#!/bin/bash
LIMIT=’80’
#Here we declare variable LIMIT with max of used spave
DIR=’/var’
#Here we declare variable DIR with name of directory
MAILTO=’
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‘
#Here we declare variable MAILTO with email address
SUBJECT=”$DIR disk usage”
#Here we declare variable SUBJECT with subject of email
MAILX=’mailx’
#Here we declare variable MAILX with mailx command that will send email
which $MAILX > /dev/null 2>&1
#Here we check if mailx command exist
if ! [ $? -eq 0 ]
#We check exit status of previous command if exit status not 0 this mean that mailx is not installed on system
then
echo “Please install $MAILX”
#Here we warn user that mailx not installed
exit 1
#Here we will exit from script
fi
cd $DIR
#To check real used size, we need to navigate to folder
USED=`df . | awk ‘{print $5}’ | sed -ne 2p | cut -d”%” -f1`
#This line will get used space of partition where we currently, this will use df command, and get used space in %, and after cut % from value.
if [ $USED -gt $LIMIT ]
#If used space is bigger than LIMIT
then
du -sh ${DIR}/* | $MAILX -s “$SUBJECT” “$MAILTO”
#This will print space usage by each directory inside directory $DIR, and after MAILX will send email with SUBJECT to MAILTO
fi
Sample Output
./check_var.sh
37M /var/cache
32K /var/db
8.0K /var/empty
4.0K /var/games
70M /var/lib
4.0K /var/local
8.0K /var/lock
38M /var/log
0 /var/mail
4.0K /var/nis
4.0K /var/opt
4.0K /var/preserve
88K /var/run
220K /var/spool
37M /var/tmp
24M /var/www
4.0K /var/yp
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