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Normally sed just passes along the edited text to STDout (printing in the terminal usually).
With the -i option it actually changes the input files. If you add an extension immediately after the -i it apparently makes a backup of the original with that extension.
Normally sed just passes along the edited text to STDout (printing in the terminal usually).
With the -i option it actually changes the input files. If you add an extension immediately after the -i it apparently makes a backup of the original with that extension.