cat /etc/os-release

linux-コマンド xubuntu 12.04 LTS

ma@ma-GA-MA78G-DS3H:~$ cat /etc/os-release
NAME="Ubuntu"
VERSION="12.04.5 LTS, Precise Pangolin"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu precise (12.04.5 LTS)"
VERSION_ID="12.04"