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Does anyone know of a UNIX command or series of commands to list lines that contains 3 matching numbers to a search with 6 numbers? For example, searching with 38 39 40 41 42 43 I would like to see combinations like 38 40 43 or 39 41 42 listed per line. Thanks.

  • Do you want only lines where these numbers are separated only by a space, and do these numbers need to be distinct and/or in the order you typed them? So what about 38 38 40 or 38 43 40? – Stefan Hamcke Dec 29 '18 at 21:42
  • Unix or UNIX. Unix is the generic name for e.g. BSD, System-V, Gnu, etc. UNIX is a brand name. – ctrl-alt-delor Dec 29 '18 at 23:27
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Assuming that you have a file named file that contains lines with mutually different whitespace-separated numbers, and you have a set of 6 numbers - e.g. 38, 39, 40, 41, 42, 43 - that you want to search for in combinations of three, such that lines that consecutively contain three of these numbers in random order are listed as a result of the search, you could use:

grep -P  '((^|\s+)(38|39|40|41|42|43)(?=($|\s))){3}' file

which uses grep with a Perl regular expression (PCRE).

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