New tutorial added to HowtoMatrix database.
Out of disk space in Linux?, find who is using your space
You will find here how to discover which directory or file is using your disk space, and therefore where makes more sence to start erasing files.
This is assuming you have all partitions in one disk, if not, do not run this command at the root level, but at each mount point of every disk you have.
I will apply this on my own hard disk, I have in my Desktop PC all directories on the same disk.
sudo du -s * | sort -n
Here is my result.