There is also an
unofficial guide and a
book.
There are unix manuals for pretty much every command. Enter
man <command>
in a terminal (no matter which distro) to read them. "man man" tells you how to use the man command. The apropos command can be used to find exact commands and their manuals. eg.
apropos font
gives you a list of every manual that has anything to do with fonts.
These are possibly the two most useful commands in the whole thing. If you want to look for a unix manual online - you can google for "man command" too. Of course, you still have to read the manual and understand it: they are usually more useful than your average help page, but harder to understand as a result.
I originally figured that if you were getting scribus to generate your sample text for printing, that it should be no trouble just to save what you had and use a different program to handle the printing. Also, if you use wysiwig, you can see where a font needs to be printed larger to see what it is ... but then, with a gui, you can browse to the font directory and the icons will show you a preview, and you can arrow-key through the collection, deleting the ones you don't like.
Then I realised that with 6300 fonts - there are no quick solutions. Fr eg. you could type a line in each font in OOo - but you'd be typing 6300 lines! We can get a script to print sample text in each font, but you still have to go back and find and delete them pretty much one at a time. So - just using the icon-preview (make the icons bigger to see it properly) and the del key seems the most efficient overall.
But then - I don't know how your fonts are organized.