If you're on a unix machine, the most fun way to do it would
be with something like:
find . -type f -exec perl -pi -e "s/string x/string y/g" {} \;
This will find all files, starting in the current directory,
and do the replacement intended. If you do not have access
to the find command, you're probably going to want to look
at
File::Find, as it's the standard perl module to handle
recursively finding files, and letting you perform some
editting on each.
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