Gradually (nearly) fill a disk. Using it to test monit rules. Obviously on a real box, with other users, the disk could fill up. Caveat user.

fill_disk.sh

#!/bin/bash

mountpoint=/tmp
sleeper=240

# percentage of disk used
function percentage { df $1 | tail -1 | awk '{print $4}' | tr -d % ; }

# Where we'll write
tempdir=$(mktemp -d --tmpdir=${mountpoint})

# Total disk in kB (Solaris needs the -k)
totalsize=$(df -k ${mountpoint}| tail -1 | awk '{print $1}')

# (roughly) 5% of the disk
writesize=$((${totalsize} / 20))

pct=$(percentage /tmp)
while [ ${pct} -lt 95 ]
do
        # Create a file (roughly) 5% of the disk size
        dd if=/dev/zero of=$(mktemp --tmpdir=${tempdir}) bs=${writesize}K count=1 &>> /dev/null
        pct=$(percentage /tmp)
        sleep ${sleeper}
done