Linux replace string / text in multiple files with grep and sed

src: https://www.internalpointers.com/post/linux-find-and-replace-text-multiple-files

How to replace a string of text in multiple files inside a directory. Useful if you need to mass change a string in multiple files to something else to avoid editing each individually.

Enter the directory, for example we will use "/opt/configs" which would contain many files ending in a ".config" extension.

In this example we will want to change the text "{JAVA}" in all of the files ending with a .config extension inside /opt/configs directory to "/opt/java8/bin/java"...

grep -RiIl '{JAVA}' *.config | xargs sed -i 's|{JAVA}|/opt/java8/bin/java|g'

If there is no output the strings have been replaced. If there is "no input files" output, that means there were no files that needed replacing.