Tool for comparing PDFs.
# To compare PDFs, indicating changes using return codes ('0' = no difference, '1' = PDFs differ):
diff-pdf <path/to/a.pdf> <path/to/b.pdf>
# To compare PDFs, outputting a PDF with visually highlighted differences:
diff-pdf --output-diff=<path/to/diff.pdf> <path/to/a.pdf> <path/to/b.pdf>
# To compare PDFs, viewing differences in a simple GUI:
diff-pdf --view <path/to/a.pdf> <path/to/b.pdf>