Nautilus, also known as “Files”, is the default file manager of the GNOME desktop environment. In a previous tutorial we saw how to create and call custom scripts from the Nautilus context-menu: this feature can be really useful but is somehow limited. By installing the nautilus-python package in our favorite Linux distribution, and writing just few lines of Python code, we can overcome such limitations and create proper Nautilus extensions.
Egidio Docile
How to remove dangling and unused Docker images
Docker is a free and open source OS-level virtualization system which allows us to pack and deliver applications together with their dependencies in isolated and reproducible environments called containers. Docker containers are built on the base of Images, which can become “dangling” in certain situations.
How to extend PCManFM with custom actions
PCManFM is a free and open source file manager which is meant to be a lightweight alternative to applications like Thunar (the default Xfce4 file manager) or Nautilus/Files (the GNOME counterpart). Although designed to by easy on resources, PCManFM doesn’t lack functionalities, and it can be extended with custom actions.
How to automatically change X11 displays setup with autorandr on Linux
Adding a monitor to a setup is probably one of the most effective and immediate ways to increase productivity. A multi monitor setup can be useful, for example, when we need to consult some kind of documentation and at the same time work on another task full-screen. Autorandr is a free and open source utility able to apply specific X11 configurations depending on the displays connected to our machine.
How to install and setup Ghost CMS on Ubuntu
Ghost is a free and open source blogging platform written in Javascript, which saw its first release in 2013. It supports writing posts both using a WYSIWYG (What You See Is What You Get) editor, and the Markdown language. Unlike WordPress, it is focused on simplicity and on being purely a blogging platform, therefore it includes SEO and and social sharing features out of the box. Ghost offers a ready-to-go hosting service, Ghost(Pro), but can be easily self-hosted.
How to send desktop notifications using notify-send
Every desktop environment on Linux has its own notification system which implements the Freedesktop notifications specifications. Some of them, like GNOME or KDE, use their own built-in notification systems which cannot be replaced; others like Xfce or Mate, use more modular components (Xfce notification daemon and Mate notification daemon, respectively). Desktop-independent notification systems also exist (dunst, for example): most of the time they are used on minimal setups (e.g. when using a plain window manager instead of full blown Desktop environments).
Introduction to the OverlayFS
The OverlayFS pseudo-filesystem was first included in the Linux kernel 3.18 release: it allows us to combine two directory trees or filesystems (an “upper” and a “lower one”) in a way that is completely transparent to the user, which is able to access files and directories on the “merged” layer just like he would do on a standard filesystem.
How to build Super Mario 64 natively on Linux
Super Mario needs no presentations: it is one of the most beloved video games characters. Super Mario 64 was originally released for the Nintendo64 console in 1996, and represented the first 3D episode of the Mario franchise. Thanks to a github project, which achieved the full decompilation of the game, it is now possible to build a native Linux port and play it without the need of a Nintendo64 emulator. In order to compile the port, an original, and legally obtained “.z64” rom of the game is needed.
How to remove unnecessary files with BleachBit on Linux
BleachBit is a free and open source application available on Linux and Windows, which can be used, among the other things, to remove unnecessary files and directories from a filesystem. BleachBit can be used to free the caches of many applications, remove cookies and browsers history, but also to shred (secure delete) files and directories.
Introduction to the dconf configuration system
Dconf is the low-level configuration system used by the GNOME desktop environment. It is basically a database, where the various configuration are stored as keys together with their values. The keys in the database can be inspected, changed, or dumped with the dconf utility or by using the dconf-editor graphical tool.
How to set filesystems mount order on modern Linux distributions
In a previous tutorial we discussed about the /etc/fstab file, and how it is used to declare the filesystems which should be mounted on boot. In the pre-Systemd era, filesystem where mounted in the order specified in the /etc/fstab file; on modern Linux distributions, instead, for a faster boot, filesystem are mounted in parallel. Systemd manages the mounting of filesystems via specifically designed units automatically generated from /etc/fstab entries. For these reasons a different strategy must be adopted to establish the dependency between two filesystems, and therefore to set their correct mount order.
How to create snapshots of QEMU/KVM guests
KVM (Kernel-based Virtual Machine) is the virtualization solution (type 1 hypervisor) included in the Linux kernel, which, by default, is used together with QEMU, the userspace software which actually performs the guest systems emulation (type 2 hypervisor). In a previous tutorial we saw how to create and manage KVM virtual machines from the command line; in this article, instead, we will learn how to create and manage guest systems snapshots using tools like virsh and virt-manager.