shell - Reliable way of finding out debian release name -

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i have script needs know release name of debian system (example: trusty, sid, wheezy etc). know can find out if on debian based system looking /etc/debian_version, but:

cat /etc/debian_version

cat /etc/issue

on debian stable produces:

root@07156660e2cd:/# cat /etc/debian_version 7.8 root@07156660e2cd:/# cat /etc/issue
debian gnu/linux 7 \n \l

on ubuntu produces:

```root@a81e3f32b147:/# cat /etc/issue ubuntu 14.04.2 lts \n \l

root@a81e3f32b147:/# cat /etc/debian_version jessie/sid ```

how ubuntu's codename (in case 'trusty')? don't want have maintain dictionary of release versions names please. there way in system find information out?

thanks!

use lsb_release:

lsb_release -c

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