how to generate ssl csr linux putty

how to generate ssl csr linux putty

Our certificate is ending i need to generate a new SSL CSR. I am on
comodo's website where i can generate ssl csr from their site, or i can
use command prompt to do so. my website www have lots of sub folders, each
sub folder points to their own domain.
My questions is, for me to execute openssl on the command prompt(i am
using putty), do i need to be in the sub folder that holds the domain name
that i want to generate the csr?
openssl req -nodes -newkey rsa:2048 -keyout myserver.key -out server.csr
Also where does the files that get generated get stored?
I did this in cpanel and it was easier. I am doing this for the first time
from the command prompt, or should i just use comodo's? i need to include
my organization name etc, so i think command prompt is better.
thanks.