How to find which Linux distribution is being used

# awk -F '=' '/^ID=/ {print $2}' /etc/os-release | tr -d '"'

or

# awk -F '=' '/^ID=/ {print $2}' /etc/os-release | sed -e 's/"//g'

or

# awk -F '=' '/^ID=/ {print $2}' /etc/os-release | awk -F'"' '{print $2}'