Change this lines :
# Doing the actual check:
tps=`$iostat $disk | grep $disk | awk '{print $2}' | sed -e 's/,/./g'`
kbread=`$iostat $disk | grep $disk | awk '{print $3}' | sed -e 's/,/./g'`
kbwritten=`$iostat $disk | grep $disk | awk '{print $4}' | sed -e 's/,/./g'`

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