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I have a set of PDFs, and I am running

strings * | grep message

This returns the strings containing that method, is there anyway I can get grep to tell me which file it is from?

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3 Answers 3

With GNU strings, use

strings --print-file-name -- *

to get the results prefixed by the file name (like grep).

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1  
As a note, this will also cause grep to match file names that match your pattern. –  Chris Down May 21 '13 at 9:21
    
Yes, I know. Unless one uses particularly weird file names, one can fix that by strings --print-file-name * | grep ': message' (the file names output by strings are terminated by : ). The main question is whether the OP wants just the file names (then using grep -l only is better), or whether he also wants the matched strings (then grep will either complain about binary garbage, or output binary garbage, and none of these is helpful). –  Uwe May 21 '13 at 9:31
    
Correction: If the pattern "message" can occur anywhere in the string, strings --print-file-name * | grep ': .*message' is better. –  Uwe May 21 '13 at 9:44
    
(assuming there's no file named foo: message for instance) –  Stéphane Chazelas May 21 '13 at 10:25
    
That was one of the two things I meant when I talked about "particularly weird file names". (The other one is newlines in file names.) –  Uwe May 21 '13 at 10:30

grep has no idea where the strings came from when using this method, because it never sees the filenames. If you want the filenames, use -l and pass the glob to grep directly:

grep -l message ./*
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Note that you need an implementation of grep like GNU grep that supports reading binary files. –  Stéphane Chazelas May 21 '13 at 9:59
    
What implementation doesn't support --? It would not be POSIX, and I seriously doubt any pre-POSIX implementation would support binary file. –  Stéphane Chazelas May 21 '13 at 10:23
    
@StephaneChazelas If I recall correctly, Plan 9. –  Chris Down May 21 '13 at 16:10
    
@StephaneChazelas Nope, I'm mistaken, Plan 9 supports --. I just tested. –  Chris Down May 21 '13 at 16:19

With GNU grep, you can do:

grep -Hobae '[[:print:]]*message[[:print:]]*' -- *

That will tell you the filename and offset within the file of every printable string containing message.

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