Linux

• Flatpak
• Check open ports

Flatpak

Flatpak is a software package system for Linux, which is supported by a wide variousity of distributions and provide features like isolated environments (so called sandboxes) or creating your own repository for your applications. Flatpak is mainly used for graphical applications.

Concepts

Runtime - Applications do not run directly in your OS, they are isolated in Sandboxes. For each application, a so called runtime is chosen. Those runtimes are a base, which can be used by multiple applications. This base contains dependencies, libraries and other requirements the app needs to be executed.

Sandbox

Repository

Build a Flatpak bundle

TODO

Check open ports

If you want to check open ports on your Linux device, you can use the ss command (socket statistics). Older versions may use netstat.

ss

Example:

ss -tulpen

Flags:

• -t → TCP
• -u → UDP
• -l → nur listening sockets
• -p → Prozess anzeigen
• -e → erweiterte Infos
• -n → keine DNS-Auflösung (schneller)