I have been searching for a free software on Linux that can remove pages from a PDF file for me. Now I have found it. And I found it has many cool features.
It is called PDFtk. If I wanna remove the first and the last page of a 10-pages pdf, all i need to do is this:
pdftk old.pdf cat 2-9 output new.pdf
The project website is http://www.pdflabs.com/tools/pdftk-the-pdf-toolkit/
Here is a simple tutorial: http://www.linux.com/learn/tutorials/442414-manipulating-pdfs-with-the-pdf-toolkit