pdftk in1.pdf in2.pdf cat output out1.pdf or (using handles): pdftk A=in1.pdf B=in2.pdf cat A B output out1.pdf or (using wildcards): pdftk *.pdf cat output combined.pdf
pdftk in.pdf cat 1-12 14-end output out1.pdf or: pdftk A=in1.pdf cat A1-12 A14-end output out1.pdf