Here is how to find and replace text across multiple files recursively.
The following command will recursively find all files with extension .html starting with the current folder. In each file, the text apple will be replaced with orange.
find . -name "*.html" -print | xargs sed -i 's/apple/orange/g'
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Acutallly, sed can edit multple files all by itself; use the option -is on linux or -i on darwin. Unfortunately, not recursive and no way to filter the list of files.
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