Bash monitor disk usage

Question

I bought a NAS box which has a cut down version of debian on it.

It ran out of space the other day and I did not realise. I am basically wanting to write a bash script that will alert me whenever the disk gets over 90% full.

Is anyone aware of a script that will do this or give me some advice on writing one?

Answer 1

#!/bin/bash
source /etc/profile

# Device to check
devname="/dev/sdb1"

let p=`df -k $devname | grep -v ^File | awk '{printf ("%i",$3*100 / $2); }'`
if [ $p -ge 90 ]
then
  df -h $devname | mail -s "Low on space" my@email.com
fi

Crontab this to run however often you want an alert

EDIT: For multiple disks

#!/bin/bash
source /etc/profile

# Devices to check
devnames="/dev/sdb1 /dev/sda1"

for devname in $devnames
do
  let p=`df -k $devname | grep -v ^File | awk '{printf ("%i",$3*100 / $2); }'`
  if [ $p -ge 90 ]
  then
    df -h $devname | mail -s "$devname is low on space" my@email.com
  fi
done

Answer 2

I tried to use Erik's answer but had issues with devices having long names which wraps the numbers and causes script to fail, also the math looked wrong to me and didn't match the percentages reported by df itself.

Here's an update to his script:

#!/bin/bash
source /etc/profile

# Devices to check
devnames="/dev/sda1 /dev/md1 /dev/mapper/vg1-mysqldisk1 /dev/mapper/vg4-ctsshare1 /dev/mapper/vg2-jbossdisk1 /dev/mapper/vg5-ctsarchive1 /dev/mapper/vg3-muledisk1"


for devname in $devnames
do
  let p=`df -Pk $devname | grep -v ^File | awk '{printf ("%i", $5) }'`
  if [ $p -ge 70 ]
  then
    df -h $devname | mail -s "$devname is low on space" my@email.com
  fi
done

Key changes are changed df -k to df -Pk to avoid line wrapping and simplified the awk to use pre-calc'd percent instead of recalcing.

Answer 3

You could also use Monit for this kind of job. It's a "free open source utility for managing and monitoring, processes, programs, files, directories and filesystems on a UNIX system".