Though I'd share the plexdrive chunk cleanup I'm using

It got min age to always keep, max age to always delete, and will stay within the set free space for the chunks inbetween:

#!/bin/bash

if pidof -o %PPID -x "$0"; then
echo "Already running, exit"
exit 1
fi

PLEXDRIVETEMP=/tmp/plexdrive/GoogleAJ/chunks
MINDISKSPACE=50000000
CURDISKSPACE=$(df -k $PLEXDRIVETEMP | tail -1 | awk '{print $4}')
FORCEMINAGE=120
FORCEMAXAGE=1440

HRDISKSPACE=$(echo "$CURDISKSPACE" | awk '{ sum=$1 ; hum[10242]="Gb";hum[1024]="Mb";hum[0]="Kb"; for (x=10243; x>=1024; x/=1024){ if (sum>=x) { printf "%.2f %s\n",sum/x,hum[x];break } }}')
echo "Starting with $HRDISKSPACE free diskspace"
HRCHUNKSPACE=$(du -s $PLEXDRIVETEMP | awk '{ sum=$1 ; hum[10242]="Gb";hum[1024]="Mb";hum[0]="Kb"; for (x=10243; x>=1024; x/=1024){ if (sum>=x) { printf "%.2f %s\n",sum/x,hum[x];break } }}')
echo "Starting with $HRCHUNKSPACE used chunkspace"

find $PLEXDRIVETEMP -mmin +$FORCEMAXAGE -amin +$FORCEMAXAGE -cmin +$FORCEMAXAGE -type f -delete

while [[ $CURDISKSPACE -le $MINDISKSPACE ]]
do
IFS= read -r -d $'\0' line < <(find $PLEXDRIVETEMP -mmin +$FORCEMINAGE -amin +$FORCEMINAGE -cmin +$FORCEMINAGE -type f -printf '%T@ %p\0' 2>/dev/null | sort -z -n)
CHUNK="${line#* }"
if [[ -z "$CHUNK" ]]; then
break
fi
echo "$CHUNK"
rm $CHUNK
CURDISKSPACE=$(df -k $PLEXDRIVETEMP | tail -1 | awk '{print $4}')
done

find $PLEXDRIVETEMP -mindepth 1 -empty -delete

CURDISKSPACE=$(df -k $PLEXDRIVETEMP | tail -1 | awk '{print $4}')
HRDISKSPACE=$(echo "$CURDISKSPACE" | awk '{ sum=$1 ; hum[10242]="Gb";hum[1024]="Mb";hum[0]="Kb"; for (x=10243; x>=1024; x/=1024){ if (sum>=x) { printf "%.2f %s\n",sum/x,hum[x];break } }}')
echo "Ended with $HRDISKSPACE free diskspace"
HRCHUNKSPACE=$(du -s $PLEXDRIVETEMP | awk '{ sum=$1 ; hum[10242]="Gb";hum[1024]="Mb";hum[0]="Kb"; for (x=10243; x>=1024; x/=1024){ if (sum>=x) { printf "%.2f %s\n",sum/x,hum[x];break } }}')
echo "Ended with $HRCHUNKSPACE used chunkspace"

[sbcrumb]

Thanks this works well for me. Can you tell me what these fields are in
MINDISKSPACE=50000000 is this Kb,GB or MB
FORCEMINAGE=120 is this days mins hours?
FORCEMAXAGE=1440 same as above.