To find which pure text files contains a given text from the command line, this is the proper command:
grep -ilr "pattern" directory
The -i option makes the search case-insensitive, -r searches the pattern recursively (that is, in the subdirectories that the actual directory might contain), and -l shows the file list where the pattern occurs.
Thanks to Juan Luis Belmonte for the tip (credit where credit is due).
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