How to filter files by content, and move them to another folder?

Question

How can I search in a folder all the files that contain the substring S, and move only these files into another folder?

Answer 1

$ for file in $(grep -l S source/*); do mv "$file" destination/; done

-L, --files-without-match
Suppress normal output; instead print the name of each input file from which no output would normally have been printed. The scanning will stop on the first match.

-l, --files-with-matches
Suppress normal output; instead print the name of each input file from which output would normally have been printed. The scanning will stop on the first match.