Shell Script to Monitor Disk Space Usage
Abstract: result=`df -kh |grep -v "Filesystem" | awk '{ print $5 }' | sed 's/%//g'`awk ‘{print $1}’ – take only first value in line. partition=`df -kh | head -$
It is a very crucial task to monitor disk space usage on any system. If not properly monitored it can end up with poor performance or application crash.
In this tutorial, I will show you a simple shell script that checks the used space on all mounted devices and warns if the used space is more than a threshold.
Shell Script Monitor Disk SpaceBelow shell script output the percentage disk space used.
Windows 10 - 100% Disk Usage in Tas...To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video
Windows 10 - 100% Disk Usage in Task Manager Fix#!/bin/bash
threshold="20"
i=2
result=`df -kh |grep -v "Filesystem" | awk '{ print $5 }' | sed 's/%//g'`
for percent in $result; do
if ((percent > threshold))
then
partition=`df -kh | head -$i | tail -1| awk '{print $1}'`
echo "$partition at $(hostname -f) is ${percent}% full"
fi
let i=$i+1
done
Script Result
bobbin@linoxide:/$ df -kh
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 52G 4.7G 45G 10% /
tmpfs 1.9G 0 1.9G 0% /lib/init/rw
udev 1.9G 192K 1.9G 1% /dev
tmpfs 1.9G 2.6M 1.9G 1% /dev/shm
/dev/sda6 92G 22G 66G 25% /home
bobbin@linoxide:/$ ./df_script.sh
/dev/sda6 at linoxide.lviv.example.com is 25% full
How this shell script works
#This set threshold value
threshold=」20″
#Counter, will be used later, set to 2, since first line in df output is description.
i=2
#Getting list of percentage of all disks, df -kh show all disk usage, grep -v – without description line, awk ‘{ print $5 }’ – we need only 5th value from line and sed ‘s/%//g’ – to remove % from result.
result=`df -kh |grep -v 「Filesystem」 | awk ‘{ print $5 }’ | sed ‘s/%//g’`
#for every value in result we start loop.
for percent in $result; do
#compare, if current value bigger than threshold, if yes next lines.
if ((percent > threshold))
then
#taking name of partition, here we use counter. Df list of all partitions, head – take only $i lines from top, tail -1 take only last line, awk ‘{print $1}’ – take only first value in line.
partition=`df -kh | head -$i | tail -1| awk ‘{print $1}’`
#print to console – what partition and how much used in %.
echo 「$partition at $(hostname -f) is ${percent}% full」
#end of if loop
fi
#counter increased by 1.
let i=$i+1
#end of for loop.
done