Replacing text in a bunch of files via console?

Question

Debian

Comrade friends, greetings.
There are sitemaps (50+ files of 20k lines each) you need to change all http:// links to https://
in all How can this be done using the console? find there or what else? Go through all the files at once and change http to https. I'm a linux noob and manually editing files is not an option at all.

Answer 1

Most likely, sed will do
(in the example, change http to https in all files in the current directory)