regex - How to find Linux Distribution name using shell script?

Question

I am writing a shell script in which I need the current operating system name to make it generic. Like:

if [ $Operating_System == "CentOS" ]
then
    echo "CentOS";
    # Do this
elif [ $Operating_System == "Ubuntu" ]
then
    echo "Ubuntu";
    # Do that
else
    echo "Unsupported Operating System";
fi

How will it be possible? Applying regular expression on lsb_release -a command or something else?

Thanks..

Answer 1

$ lsb_release -i
Distributor ID: Fedora
$ lsb_release -i | cut -f 2-
Fedora