Good document/resources to learn for non-gui configuration?

been using asterisk with freepbx/trixbox/elastix.
and it has been 100% gui configuration for me.
i feel more powerful ways of using asterisk lie in non-gui configuration.
when i see something like,

exten=> blah blah blah,

i feel helpless.
if you would point to a good document(s), i’d appreciate it.

Wow some one that wants to learn the real deal :wink:.
Read this book (Asterisk: The future of telephony).


I also would like to see more documents concerning asterisk without gui.

thanks for the link.

j is your friend

For the other newbies who may try that link, it should be