How to search contents of multiple pdf files?

How could I search the contents of PDF files in a directory/subdirectory? I am looking for some command line tools. It seems that grep can't search PDF files.

Solution 1:

There is pdfgrep, which does exactly what its name suggests.

pdfgrep -R 'a pattern to search recursively from path' /some/path

I've used it for simple searches and it worked fine.

(There are packages in Debian, Ubuntu and Fedora.)

Since version 1.3.0 pdfgrep supports recursive search. This version is available in Ubuntu since Ubuntu 12.10 (Quantal).

Solution 2:

Your distribution should provide a utility called pdftotext:

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

The "-" is necessary to have pdftotext output to stdout, not to files. The --with-filename and --label= options will put the file name in the output of grep. The optional --color flag is nice and tells grep to output using colors on the terminal.

(In Ubuntu, pdftotext is provided by the package xpdf-utils or poppler-utils.)

This method, using pdftotext and grep, has an advantage over pdfgrep if you want to use features of GNU grep that pdfgrep doesn't support. Note: pdfgrep-1.3.x supports -C option for printing line of context.