bash merge multiple pdf files

A) Using mutool

apt-get install mupdf-tools

mutool merge [options] file1 [pages] file2 [pages] ...

Options:

-o output

The output filename.

-O options

See mutool create for details on this option. 

 

Source: https://mupdf.com/docs/manual-mutool-merge.html

B) Using pdfunite. If needed, install poppler package

example uses:

pdfunite in-1.pdf in-2.pdf in-n.pdf out.pdf

pdfunite *.pdf out.pdf

Src:http://stackoverflow.com/questions/2507766/merge-convert-multiple-pdf-files-into-one-pdf