Convert a large-sheeted pdf into multiple A4 pages for printing.

# To convert an A2 poster into 4 A4 pages:
pdfposter --poster-size a2 <input_file.pdf> <output_file.pdf>

# To scale an A4 poster to A3 and then generate 2 A4 pages:
pdfposter --scale 2 <input_file.pdf> <output_file.pdf>