How to find files containing two strings together in Linux?

Question

I want to find files containing two strings together, for example the file contains both string1 and string2.

I want the full path of files in output. I don't want to see "permission denied" warnings.

Answer 1

grep -l string2 `grep -l string1 /path/*`

which is the same as

grep -l string2 $(grep string1 /path/*)

---

Edit: heres why grep string1 /path/* | grep string2 doesn't do what I think alwbtc wants.

$ cd /tmp
$ cat a
apples
oranges
bananas
$ cat b
apples
mangoes
lemons
$ cat c
mangoes
limes
pears
$ cd ~
$ grep apples /tmp/* | grep mangoes
$

Nothing found, but file b contains both strings.

Here's what I think alwbtc wants

$ grep -l apples $(grep -l mangoes /tmp/*)
/tmp/b

Answer 2

Pipe one grep into another:

grep "string1" /path/to/files/* | grep "string2"

Answer 3

comm -12 <(grep --fixed-strings --files-with-matches "STRING1" /path/to/files/* 2>/dev/null | sort) <(grep --fixed-strings --files-with-matches "STRING1" /path/to/files/* 2>/dev/null | sort)

or less redundantly:

search_files () { str="$1"; shift; grep -Fl "$str" "$@" 2>/dev/null | sort; }
comm -12 <(search_files "STRING1" /path/to/files/*) <(sf "STRING2" /path/to/files/*)

This will work if the strings are on different lines of the same file and will also avoid false positives if a filename contains one of the strings.