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Rename multiple ebook files using the power of ruby. This is the alternate version of my ebook_renamer gem that implemented in pure ruby using the power of other gems for metadata extraction.

The original ebook_renamer gem requires the Calibre Meta to be installed, but this gem does not need any third party software to be installed.


  • Rename multiple ebooks at once currently epub, mobi and pdf are supported.

  • Use of the following information as part of the file

    • title - common for (epub, pdf, mobi)
    • author - common for (epub, pdf, mobi)
    • total pages - currently only pdf file will have this metadata information
    • publisher - common for (mobi, epub)

The output file will be something like (if all of the metadata are available)

# if '_' is the `--sep-string` is '_'

# The minimal possible final file name will be

If the title is not available then no action will be performed.

  • Use feature of other ruby gems to extract metadata

    • pdf-reader gem to extract pdf metadata
    • mobi gem to extract mobi metadata
    • epubinfo gem to extract epub metadat
  • Sanitized file name if the metadata contain invalid/special characters.

  • If the metadata is not available then the rename will not be performed

  • If the result name is the same as the original name then no rename is performed.


Or install it yourself as:

$ gem install ebooks_renamer


  • For help and usage just type ebooks_renamer without any options

  -b, [--base-dir=BASE_DIR]                # Base directory
                                           # Default: . (current directory)
  -r, [--recursive], [--no-recursive]      # Search for files recursively
                                           # Default: true
  -v, [--version], [--no-version]          # Display version information
  -s, [--sep-string=SEP_STRING]            # Separator string between words in filename
                                           # Default: .
  -c, [--commit], [--no-commit]            # Make change permanent

Rename ebooks based on given criteria

Usage Example:

Here is your typical usage of the gem

# change to the directory that contain your ebook files
cd ~/Dropbox/ebooks

# set version of your ruby to a recent version
rbenv local 2.1.2 # or any version after 1.9+

# install the gem
gem install ebooks_renamer

# run the command without making any changes
ebooks_renamer --base-dir . --recursive

# If you are happy with what will be changed then you can make your change permanent

ebooks_renamer --base-dir . --recursive --commit

# To change the default separator string `sep_string` (default to '.' - dot string)
# e.g. this will use the '_' (underscore) to separate each word in the output
ebooks_renamer rename --base-dir . --sep-string '_' --recursive --commit


  1. Fork it
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create new Pull Request