Basic file reading?

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IKG

I just need help understanding the basics of reading opened files. I want to be able to open a text file, jump from line to line, and read values separated by spaces or special signs.

I brought this up in a thread awhile back, but it kinda went off-topic and now I need to know. I know this is a broad question, but maybe some of you have some simple examples? I'm not looking for source code to use; just something to learn from.

Thanks :)