I need to take a text file, read it line by line, and put certain lines into an array...

I need some help on the reading line by line part...

Can anyone steer me in the right direction? I don't need to read it all into an array, just 1 line at a time, and if the line meets certain criteria, put THAT LINE in an array...(I can handle the "if it meets certain criteria" part...)

Thanks!!