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

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i want grep files containing words dansk, svenska or norsk on line, usable returncode (as have info strings contained, one-liner goes little further this).

i have many files lines in them 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 pseudocode of want:

for files in directory;  if file contains "dansk" , "norsk" , "svenska"  echo filename end

what best way this? can done on 1 line?

you can use: 

grep -l dansk * | xargs grep -l norsk | xargs grep -l svenska

if want find in hidden files:

grep -l dansk .* | xargs grep -l norsk | xargs grep -l svenska

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