I have to check the (well written and example-rich) man page every time I need to do this kind of things, but:
#pdftk is awesome!
Last iteration, with line breaks for readability:
```
pdftk
A=attestation-conformite-documents-comptables+signature.pdf
B=etats-financiers.pdf
cat A B1-10
output comptes-annuels+signature.pdf
```
Subtitle: concatenate two PDFs into a single one, only retaining the first 10 pages of the second one.
(Once-a-year dance, now documented in a README.md)
