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

[ghost]

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.