Ever wanted to combine or merger many pdf files to a single file , no issues , you can do it easily on the shell.

If PDF is electronic paper, then pdftk is an electronic staple-remover,hole-punch, binder, secret-decoder-ring, and X-Ray-glasses. Pdftk is a simple tool for doing everyday things with PDF documents. Use it to:

   * Merge PDF Documents
   * Split PDF Pages into a New Document
   * Rotate PDF Documents or Pages
   * Decrypt Input as Necessary (Password Required)
   * Encrypt Output as Desired
   * Fill PDF Forms with X/FDF Data and/or Flatten Forms
   * Generate FDF Data Stencil from PDF Forms
   * Apply a Background Watermark or a Foreground Stamp
   * Report PDF Metrics such as Metadata and Bookmarks
   * Update PDF Metadata
   * Attach Files to PDF Pages or the PDF Document
   * Unpack PDF Attachments
   * Burst a PDF Document into Single Pages
   * Uncompress and Re-Compress Page Streams
   * Repair Corrupted PDF (Where Possible)

Do this first : sudo apt-get install pdftk To merge : pdftk *.pdf cat output all.pdf