How do you use dup2 and fork together?

How do you use dup2 and fork together?

unix exec fork dup2

unix

Duplicate, but still use stdout

c file unix dup2

unix

How to recover stdin overwritten by dup2?

c unix file-descriptor dup2

unix

Why does touch call the dup2() syscall?

file unix dup2

unix

How to swap two open file descriptors?

c sockets unix file-descriptor dup2

unix

Are STDIN_FILENO and STDOUT_FILENO read only in c?

c unix file-descriptor dup2

unix

Redirect FROM stderr to another file descriptor

c++ unix pipe stderr dup2

unix