If you are using e-book readers, changing meta information in PDF files might be useful. The PDF Toolkit has powerful capabilities that includes updating PDF metadata. Even though pdftk is a command line application and does not have editing feature, updating is a really simple process. All you have to do is, extract current metadata into a text file, edit it, and update the PDF file!
The following command extracts metadata from PDF file to metadata.txt
pdftk example.pdf dump_data output metadata.txt
Now, you can edit metadata.txt file with your favorite text editor. An example PDF metadata:
InfoKey: Title InfoValue: Changing PDF Metadata under Linux InfoKey: Author InfoValue: Onur Guzel
Remember, you should only change “InfoValue”s. After editing metadata, you can update your PDF file by running the following command:
pdftk example.pdf update_info metadata.txt output example_updated.pdf