Take the 2-minute tour ×
Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems.. It's 100% free, no registration required.

Is there a way to search pdf files using the power of grep, without converting to text first in Ubuntu?

share|improve this question
1  
I think you need to parse it thou pdf2text in order to get some usable results back... –  Johan Jan 31 '11 at 14:29
1  

9 Answers 9

up vote 22 down vote accepted

If you have poppler-utils installed (default on Ubuntu Desktop), you could "convert" it on the fly and pipe it to grep:

pdftotext my.pdf - | grep 'pattern'

This won't create a .txt file.

share|improve this answer
    
so .. you extract the text before you grep it which means the answer is "no". –  akira Jan 31 '11 at 15:18
7  
@akira The OP probably meant "without opening the PDF in a viewer and exporting to text" –  Michael Mrozek Jan 31 '11 at 17:36
    
@Michael Mrozek: then that should be clarified by OP, but "grep only" is pretty clear to me. –  akira Jan 31 '11 at 18:38
3  
@akira Where do you see "grep only"? –  Michael Mrozek Jan 31 '11 at 18:55
2  
@akira Well, I already said what I think he probably meant; he doesn't want to export to text before processing it. I very much doubt he has a problem with any command that converts to text in any way; there's no reason not to –  Michael Mrozek Feb 1 '11 at 5:52

You could pipe it through strings first:-

cat file.pdf | strings | grep <...etc...>
share|improve this answer
4  
Just use strings file.pdf | grep <...>, you don't need cat –  phunehehe Jan 31 '11 at 14:31
    
Yeah - my mind seems to work better with streams... :-) –  Andy Smith Jan 31 '11 at 14:57
5  
wont work if text is compressed, which it is most of the times. –  akira Jan 31 '11 at 15:18
4  
Even if the text is uncompressed, it's generally small pieces of sentences (not even necessarily whole words!) finely intermixed with formatting information. Not very friendly for strings or grep. –  Jander Jan 31 '11 at 16:08

gpdf might be what you need if you're using Gnome! Check this in case you're not using Gnome. It's got a list of CLI pdf viewers. Then you can use grep to find some pattern.

Hope that helps.

share|improve this answer

No.

A pdf consists of chunks of data, some of them text, some of them pictures and some of them really magical fancy XYZ (eg. .u3d files). Those chunks are most of the times compressed (eg. flat, check http://www.verypdf.com/pdfinfoeditor/compression.htm). In order to 'grep' a .pdf you have to reverse the compression aka extract the text.

You can do that either per file with tools such as pdf2text and grep the result, or you run an 'indexer' (look at xapian.org or lucene) which builds an searchable index out of your .pdf files and then you can use the search engine tools of that indexer to get the content of the pdf.

But no, you can not grep pdf files and hope for reliable answers without extracting the text first.

share|improve this answer

Install the package pdfgrep, then use the command:

find /path -iname '*.pdf' -exec pdfgrep pattern {} +
share|improve this answer
    
This works in mac osx (Mavericks) as well. Install it using brew. Simple. Thanks. –  mikiemorales Jan 23 at 1:28
    
Out of curiosity I checked the source of pdfgrep and it uses poppler to extract strings from the pdf. Almost exactly as @wag's answer only pagewise rather than, presumably, the entire document. –  Andrew Martin Sep 16 at 11:11

try this

find /path -iname *.pdf -print0 | for i in `xargs 0`; do echo $i; \
    pdftotext "$i" - | grep pattern; done

for printing the lines the pattern occurs inside the pdf

share|improve this answer

Recoll can search PDFs. It doesn't support regular expressions, but it has lots of other search options, so it might fit your needs.

share|improve this answer

Take a look at the common resource grep tool crgrep which supports searching within PDF files.

It also allows searching other resources like content nested in archives, database tables, image meta-data, POM file dependencies and web resources - and combinations of these including recursive search.

share|improve this answer

There is a duplicate question on StackOverflow. The people there suggest a variation of harish.venkarts answer:

find /path -name '*.pdf' -exec sh -c 'pdftotext "{}" - | grep --with-filename --label="{}" --color "your pattern"' \;

The advantage over the similar answer here is the --with-filename flag for grep. This is somewhat superior to pdfgrep as well, because the standard grep has more features.

https://stackoverflow.com/questions/4643438/how-to-search-contents-of-multiple-pdf-files

share|improve this answer
    
I think it would have been better to leave this as a comment (or edit) in the similar answer you are referring to. –  Bernhard May 9 at 12:07

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.