Pdftk allows to manipulate PDF easily and freely. It does not require Acrobat, and it runs on Windows, Linux, Mac OS X, FreeBSD and Solaris etc.
Features:
- Merge PDF Documents
- Split PDF Pages into a New Document
- Rotate PDF Pages or Documents
- Decrypt Input as Necessary (Password Required)
- Encrypt Output as Desired
- Fill PDF Forms with FDF Data or XFDF Data and/or Flatten Forms
- Apply a Background Watermark or a Foreground Stamp
- Report on PDF Metrics such as Metadata, Bookmarks, and Page Labels
- 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)
Install pdftk on fedora/linux:
# yum install pdftk
# which pdftk
Merge Two or More PDFs into a New Document
# pdftk 1.pdf 2.pdf 3.pdf cat output 123.pdf
Source: http://www.accesspdf.com/pdftk/
