macbook drive is so full that finder won't run properly in order to delete any files

MacBook Pro hard disk is so full that it won't start properly.

Finder stops responding.

Tried to install OmniDiskSweeper, but there isn't enough disk space to install it.

Computer sometimes will boot in Safe mode, sometimes it won't

Disk Utiility finds a couple of minor things and successfully repairs them

Is there any other way to locate and delete files other than Finder?