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Another way of do it in debian like distros, don't know if works for others
There are 4 alternatives - vote for the best!
If you can do better, submit your command here.
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/etc/issue is the message that precedes the "login:" prompt on a terminal. It does not necessarily report the linux version. An overly cautious sysadmin may empty or replace the file so strangers are not informed of the linux flavour and version when trying to break in.
What happen if the admin modifies /etc/*-release?
Could it break some system funcionality (updates, messages, etc) if this file changes?