what programs can I use to find text in files?

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http://www.linuxquestions.org – For some reason, Kfind-trinity, the file finding utility that I have in Konqueror-trinity, just doesn't work in finding specified text within files. It doesn't find anything I look for even if I know the text is definitely in the file(s). What other programs can look for text in files? (HowTos)