Man pages matching name dup2 in section 2:

dup2.2.de	debian 10 / manpages-de-dev
dup2.2.en	debian 10 / manpages-dev
dup2.2.es	debian 10 / manpages-es
dup2.2.ja	debian 10 / manpages-ja-dev
dup2.2.pl	debian 10 / manpages-pl-dev
dup2.2.de	debian 11 / manpages-de-dev
dup2.2.en	debian 11 / manpages-dev
dup2.2.fr	debian 11 / manpages-fr-dev
dup2.2.ja	debian 11 / manpages-ja-dev
dup2.2.de	debian 12 / manpages-de-dev
dup2.2.en	debian 12 / manpages-dev
dup2.2.fr	debian 12 / manpages-fr-dev
dup2.2.ja	debian 12 / manpages-ja-dev
dup2.2.nl	debian 12 / manpages-nl-dev