Here is an overview on howto use ufw the Uncomplicated Firewall:

Lets turn UFW on:
sudo ufw enable

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I spend most of my time working in front of a black and white terminal of remote SSH connections to various servers. This means that I use bash (as my preferred shell) most of the day. And bash history is a very important feature of bash that saves me much time by recalling previous commands I have typed. Here are some tricks on how you can optimize with some simple configurations settings the usage your bash history.
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