linux ⁽¹³⁾

awk and sed are text manipulation programs. You can use them for example to replace strings: echo image.jpg | sed 's/\.jpg/.png/' image.png or change order of strings: echo "hello world" | awk '{print $2, $1}' world hello awk and sed are harder to learn than…

Lets Suppose you need to perform a certain kind of work in all of these directories:  You might know about the "cd" command. But isn't it annoying if you need to use and retype a lot of Commands, like for example: $ cd ~/Work/Projects/Web/src $…

Requirements and Preparation Unfortunately Heroku currently only Supports Tomcat version 9.x. As a consequence you're not able to use the Java Jakarta Servlets, since they are only supported with Tomcat version 10.x. As a consequence you need to replace all your Jakarta Servlet imports with…

Did you know that your ssh Client sends the server all your public keys, one by one, until the server accepts one, when you try to authenticate via public key? Don't believe me? Try it out yourself: ssh whoami.filippo.io Someone could use this to find…

What is OPNsense? OPNsense® is an open source, easy-to-use and easy-to-build FreeBSD based firewall and routing platform. OPNsense includes most of the features available in expensive commercial firewalls, and more in many cases. It brings the rich feature set of commercial offerings with the benefits…