How to edit many files?

Question

Command line

Tell me, I have 30 thousand files. For example, they have the same tag everywhere, for example New, I want to change it to Changed everywhere, Sometimes in one file you need to make such 5-10 changes.
How can this be implemented at all? Through the command line or is there a program in which you can do this?

Answer 1

find ./<путь> -type f  -exec sed -i s'/<подстрока>/<замена>/g' {} \;

Answer 2

man sed

Answer 3

The same notepad ++ can search and replace in several files, including by file mask and with support for regular