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Multiple File Search And Replace
perl -pi -w -e 's/search/replace/g;' *.txt
Bear in mind what's between the single quotes after the -e option is a line of Perl code and the search argument is a regular expression, so some characters will have special meanings. You can escape special characters (like the forward-slash, dot, caret, dollar sign, and so on) by preceeding them with a back-slash.