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- grep for the word in a files, use recursion (to find files in sub directories), and list only file matches
-| xargs passes the results from the grep command to sed
-sed -i uses a regular expression (regex) to evaluate the change: s (search) / search word / target word / g (global replace)
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If you are using grep's -r switch, thus running a recursive search, you can specify the present working directory name instead of the glob * in order to search for all files. That will also search for dot files and will be more efficient.
i.e.
grep -lr -e '<oldword>' .instead of
grep -lr -e '<oldword>' *Also I'd recommend -s -I grep options to skip read access errors and binary files
Thanks for your input folks :)