When troubleshooting hardware and software issues in a linux environment, identifying the distribution name (Ubuntu, Red Hat, Fedora), release number and codename can be invaluable. A ‘quick google’ for an error message without including such information can often lead to irrelevant and mis-leading results. Including these details can often provide far more helpful results as they are usually quoted alongside reported issues and hopefully the fixes for them.
The ‘cat’ (concatenate) command can be run from a linux shell and can be used to display the contents of individual or multiple files.
$ cat [OPTION] [FILE] ...
We can use this command to combine and display the files which give us release information found in /etc/ by using the following command:
$ cat /etc/*-release
In this example we can see the operating system is Ubuntu release 14.04 LTS (trusty) and some extra support information:
firstname.lastname@example.org:~$ cat /etc/*-release DISTRIB_ID=Ubuntu DISTRIB_RELEASE=14.04 DISTRIB_CODENAME=trusty DISTRIB_DESCRIPTION="Ubuntu 14.04.4 LTS" NAME="Ubuntu" VERSION="14.04.4 LTS, Trusty Tahr" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Ubuntu 14.04.4 LTS" VERSION_ID="14.04" HOME_URL="http://www.ubuntu.com/" SUPPORT_URL="http://help.ubuntu.com/" BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"