grep for multiple strings in file on different lines (ie. whole file, not line based search)?

Question

I want to grep for files containing the words Dansk, Svenska or Norsk on any line, with a usable returncode (as I really only like to have the info that the strings are contained, my one-liner goes a little further then this).

I have many files with lines in them like this:

Disc Title: unknown Title: 01, Length: 01:33:37.000 Chapters: 33, Cells: 31, Audio streams: 04, Subpictures: 20         Subtitle: 01, Language: ar - Arabic, Content: Undefined, Stream id: 0x20,          Subtitle: 02, Language: bg - Bulgarian, Content: Undefined, Stream id: 0x21,          Subtitle: 03, Language: cs - Czech, Content: Undefined, Stream id: 0x22,          Subtitle: 04, Language: da - Dansk, Content: Undefined, Stream id: 0x23,          Subtitle: 05, Language: de - Deutsch, Content: Undefined, Stream id: 0x24,  (...) 

Here is the pseudocode of what I want:

for all files in directory;  if file contains "Dansk" AND "Norsk" AND "Svenska" then  then echo the filename end 

What is the best way to do this? Can it be done on one line?

Answer 1

You can use:

grep -l Dansk * | xargs grep -l Norsk | xargs grep -l Svenska 

If you want also to find in hidden files:

grep -l Dansk .* | xargs grep -l Norsk | xargs grep -l Svenska 

Answer 2

Yet another way using just bash and grep:

For a single file 'test.txt':

   grep -q Dansk test.txt && grep -q Norsk test.txt && grep -l Svenska test.txt 

Will print test.txt iff the file contains all three (in any combination). The first two greps don't print anything (-q) and the last only prints the file if the other two have passed.

If you want to do it for every file in the directory:

    for f in *; do grep -q Dansk $f && grep -q Norsk $f && grep -l Svenska $f; done