Grep Search all files in directory for string1 AND string2

Question

How can I make use of grep in cygwin to find all files that contain BOTH words.

This is what I use to search all files in a directory recursively fo

Answer 1

Do you mean "string1" and "string2" on the same line?

grep 'string1.*string2'

On the same line but in indeterminate order?

grep '(string1.*string2)|(string2.*string1)'

Or both strings must appear in the file anywhere?

grep -e string1 -e string2