You'll want to use:
$ cat /etc/*-release
You'll get a response similar to this:
$ cat /etc/*-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=11.10
DISTRIB_CODENAME=oneiric
DISTRIB_DESCRIPTION="Ubuntu 11.10"
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Removed information around cat /etc/proc as it's unneeded and this continues to provide the most general way of obtaining distro info.
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