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Grep: show filename and line number

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Last Modified: 2013-12-21
I have 1GB directory which has many files with a string like 'abc123' in it. When I query the files now and pipe the results in a text file, I get a very big file back, which is probably the result of very long lines in the source file.

Now I use: grep -inR 'abc123' *, which returns filename, linenumber, plus the whole line, which can be very long. Is it possible to shorten that line, or even leave it out?
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