How to solve Synology "You cannot login to the system because the disk space is full currently"

synology_disk_space.sh

#!/bin/bash

#1. See what partition is full:
df -h

#2. Find largest directories:
du -hax / 2> /dev/null | sort -rh | head -n 20

#3. Find fattest files:
find . -type f -printf "%s\t%p\n" | sort -n | tail -n 20

# then remove the largest unneeded files using the 'admin' password:
# sudo rm -f {files}