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I'm looking for a way to display the filename when using this command:

cat *.tcp | grep "tcp" | grep "open" | sort | uniq

Is there a way to do it?

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grep tcp *.tcp | grep open | sort -u

Giving multiple filenames to grep will, by default, cause grep to prefix the matching output lines with the filename(s) they matched in. The only other change I made was to combine sort | uniq into sort -u (and to remove the quotes that are unnecessary here).

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    +1 although I think it has the potential for false matches if any of the filenames matches the pattern open: maybe that's not an issue in this particular application - otherwise perhaps consider replacing the second grep by an awk e.g. awk -F: '$2 ~ /open/'? – steeldriver Jul 8 '15 at 17:41
  • fair point on the filename possibly matching, although the OP's question implied that filenames would become part of the pipeline regardless. The awk statement you have now wouldn't quite work; it's only matching against field 2, and would miss matches in fields 3 & on. – Jeff Schaller Jul 8 '15 at 18:04
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grep  -H 'tcp'  

-H, --with-filename Print the file name for each match. This is the default when there is more than one file to search.

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    How would I incorporate this into my command and keep the formatting of the columns that my command gives me? – Proletariat Jul 8 '15 at 16:24

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