shellscript - avoid hdd spin-down.

KeepSpinning.sh

#!/bin/sh

# this script finds out the mountpoint for the given DISKLABEL
# and touches the file ${MOUNTPOINT}/tempfile periodically every
# INTERVAL.

# adjust the following two values.
DISKLABEL="WD_500G_NTFS"
INTERVAL="5s"

# get line with our disklabel
MOUNTLINE=$(mount -l | grep "$DISKLABEL");

# check if mounted
if [ "$MOUNTLINE" == "" ]
then
        echo "Error: Partition with disklabel $DISKLABEL not mounted."
        exit 1
fi

# get mountpoint
# FIXME: 
# not sure if awk command always returns 
# the correct mountpoint or an empty string...
MOUNTPOINT=$(echo $MOUNTLINE | awk '{ print $3 }')

# check if mountpoint begins with /media/ to prevent errors by 
# mountpoint extraction above.
# dirty. problem when partition is mounted somewhere else.. :-(
(echo $MOUNTPOINT | grep "\/media\/") &> /dev/null; RC=$?
if ! [ "$RC" = 0 ]
then
        echo "Error: problem extracting mountpoint."
        exit 2
fi

echo "Found mountpoint for partition labeled '$DISKLABEL' at '$MOUNTPOINT'."
echo "Touching and syncing ${MOUNTPOINT}/tempfile every ${INTERVAL}..."
echo "Quit with ^C."

while true
do
        touch ${MOUNTPOINT}/tempfile
        sleep ${INTERVAL}
        sync
done