pdfunite merges several PDF (Portable Document Format) files in order of their occurrence on command line to one PDF result file.
pdfunite file1.pdf file2.pdf file3.pdf mergedPDFs.pdf
user@server:~$ ls -lh
-rw-rw-r-- 1 user user 768k Mar 27 11:20 file1.pdf
-rw-rw-r-- 1 user user 1,1M May 11 12:39 file2.pdf
-rw-rw-r-- 1 user user 64k Jun 02 06:52 file3.pdf
-rw-rw-r-- 1 user user 1,9M Nov 11 16:27 mergedPDFs.pdf
pdfseparate extract single pages from a Portable Document Format (PDF).
user@server:~$ pdfseparate -f 5 -l 10 manual.pdf extracted-%d.pdf
user@server:~$ ls -lh
-rw-rw-r-- 1 user user 13,8M Sep 27 14:19 manual.pdf
-rw-rw-r-- 1 user user 1,2M Nov 11 16:27 extracted-1.pdf
-rw-rw-r-- 1 user user 1,9M Nov 11 16:27 extracted-2.pdf
...
-rw-rw-r-- 1 user user 1,4M Nov 11 16:27 extracted-6.pdf