[poppler] pdfunite - joining multiple pdf files without page break

[Gabor Z. Papp]

* suzuki toshiya <mpsuzuki at hiroshima-u.ac.jp>:

| The way to do such with existing tool only would be
| ImageMagick, but the result would be rasterized picture.

Could you show me an example commandline how to do this with ImageMagick?