Using sudo with multiple commands or functions

Question

Neither of these work. Can you tell me why sudo does not work with a function, and is there a way to make it work with a function like this?

yy() { yum upgrade -y; yum upgrade -y; }
sudo yy

or:

sudo $(yum upgrade -y; yum upgrade -y)

Answer 1

You are creating a subshell. What you are doing is executing the output of the command as sudo. Try

sudo bash -c 'yum upgrade -y; yum upgrade -y'