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Given I have a file with several words, how can I do the following:

How can I replace AAA for BBB in a file with Unix?

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    sed -i.bak 's/AAA/BBB/g' – Kevin Jan 31 '13 at 19:02
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    I downvoted the question, because it didn't show any research effort. – Bernhard Jan 31 '13 at 19:05
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sed s/AAA/BBB/g input.txt > output.txt

You can then check output.txt and copy it over input.txt. Learn more about sed here.

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