Paste the following in your shell:
cat << EOF >> ~/.bashrc
alias nocom='sed -e "/^\s*#/d" -e "/^\s*$/d"'
EOF
This sets up an alias, so that you don’t have to memorize it (which is impossible to begin with).
If you want this to be available for all new users, also add this to the /etc/skel/.bashrc
file (tested on CentOS):
sudo cat > /etc/skel/.bashrc
alias nocom='sed -e "/^\s*#/d" -e "/^\s*$/d"'
EOF
Open a new session, and you’ll have the new nocom
command. Then you can just
nocom /etc/foobar.conf
Cheers.