lsb_release
lsb_release prints certain LSB (Linux Standard Base) and Distribution information.
Display the string id of the distributor
lsb_release -i
Display the single line text description of the distribution
lsb_release -d
Display the release number of the distribution
lsb_release -r
Display the codename according to the distribution release
lsb_release -c
Display all of the above information
lsb_release -a
Use short output format for information requested by other options (or version if none)
lsb_release -s