Sed

https://www.computerhope.com/unix/used.htm

https://likegeeks.com/sed-linux/#Read-DataFrom-a-File

http://www.grymoire.com/Unix/Sed.html

https://www.tecmint.com/linux-sed-command-tips-tricks/

https://www.linuxtechi.com/20-sed-command-examples-linux-users/

https://stackoverflow.com/questions/16956810/how-do-i-find-all-files-containing-specific-text-on-linux

https://unix.stackexchange.com/questions/159367/using-sed-to-find-and-replace

https://unix.stackexchange.com/questions/212925/using-sed-to-replace-special-characters

https://stackoverflow.com/questions/17357952/how-do-i-replace-single-quotes-with-another-character-in-sed