suppose I have some pdf pages like

front.pdf, toc.pdf, auth_colo.pdf, part1.pdf, chap01.pdf,
chap02.pdf, part2.pdf, chap03.pdf, chap04.pdf, chap05.pdf,
part3.pdf, app_A.pdf, app_B.pdf, and, index.pdf

I want to merge all the pdf’s into a single book, then my command will be

pdftk front.pdf toc.pdf auth_colo.pdf part1.pdf chap01.pdf ... index.pdf cat output my_full_book.pdf

this will create a pdf file in the same order in which I have specified. *.pdf may also work if I don’t care about page ordering. Remember that my_full_book.pdf is my output file name and cat output are output flags.

suppose I want to remove ‘pages 3’ then my command will be

pdftk my_full_book.pdf cat 1-2 4-end output full_book_with_page2-removed.pdf

in the above example, I have skipped page number which I want to remove, page 3 in this case. The above command means, I want pages to be included from 1 to 2, I don’t want page number 3, so skip it, then start from page 4 till the end.

the syntax goes like this

pdftk PDF_FILE cat FROM-TO FROM-end output NEW_PDF_FILE_NAME

If I want to rotate the first page at 90 degrees right, then

pdftk my_full_book.pdf cat 1R 2-end output page1_turned_right.pdf

in the same way if I want to rotate all odd pages from range 1 to 25 to 180 degrees, then

pdftk my_full_book.pdf cat 1-25oddD 26-end output odd_pages_book.pdf

For more info on pdftk, visit its manual pages by typing

man pdftk