Pratique du Shadowing: Every LINUX Concept Explained in 8 Minutes. - Apprendre l'anglais à l'oral avec YouTube

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Linux is not really an operating system.
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Linux is not really an operating system.
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It's a kernel, the core that manages hardware, memory, processes, and communication between software and hardware.
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You interact with it using a shell, the command line interface, like Bash or ZSH, where you type commands to control the system.
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That shell runs inside a terminal, a program that gives you access to type and run those commands.
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All files and programs live in a file system hierarchy, a tree-like structure starting from the root slash directory.
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The most powerful account is the root user, the super user with unlimited access to the system.
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To keep control, Linux uses permissions, which decide who can read, write, or execute files and directories.
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When you run a program, Linux creates a process, each identified by a unique process ID, PID.
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Many of these processes are managed by an init system, like Systemd, which is the first process the kernel starts and is responsible for launching services.
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Some of these services are daemons, background processes like SSHD or cron that don't need direct user interaction.
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To install or update programs, Linux uses a package manager, such as apt, dnf, or pacman,
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which fetch software from package repositories maintained by the distribution.
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These programs can also depend on kernel modules, pieces of code you can load into the kernel to add features like hardware drivers.
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To automate tasks, you can write a shell script, a simple text file with a list of commands.
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Scripts and commands often rely on environment variables, like $path, which tells Linux where to look for executables.
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You can connect commands together with pipes, sending the output of one command as input to another.
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And with redirection, you can send output into files or read input from files.
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This works because Linux treats input and output as standard streams stdin for input,
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stdout for normal output, and urits for error messages.
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Files themselves can be connected using symbolic links, shortcuts that point to another file or directory,
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or hard links, which are alternative names pointing to the same data on disk.
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Storage devices like USB-S or partitions are added into the system by mounting them onto directories.
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When physical memory fills up, Linux uses swap space, an area on disk that acts as backup memory.
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Linux can also perform tasks on its own through cron jobs, scheduled commands that run at fixed times.
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The results of these jobs and many other events are saved in system logs under slash var slash log, which help you troubleshoot problems.
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Networking is another key part of Linux, handled by networking commands like ping, sss, or ip.
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To connect securely to another computer, you use SSH, which encrypts your login and commands.
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When you need administrative power without logging in as root, you use sudo, which lets a normal user run privileged commands.
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To monitor what's happening on the system, commands like top or htop show you active processes, CPU usage, and memory.
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Internally, processes can be controlled using signals like signal kill or signal terminate, which tell them to stop or restart.
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They also rely on file descriptors, which are IDs used by the system to keep track of open files and sockets.
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Linux can boot into different run levels, or targets, which define the system's mode, like single user, multi-user, or graphical mode.
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If you want multiple terminals in one, you can use a terminal multiplexer, like tmux, which lets you split windows and keep sessions alive.
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For storage management, Linux provides tools like fdisk and parted to create or resize partitions,
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and LVM for flexible disk management.
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File systems themselves can vary.
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Common types are ext4, xfs, and btrfs, each offering different performance and features.
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You can check disk usage with commands like df for overall space and du for directory sizes.
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Security is another big part of Linux.
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Firewalls like IP tables or UFW control incoming and outgoing network traffic.
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More advanced systems use SE Linux or AppArmor, which enforce mandatory access controls for extra protection.
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For authentication, Linux relies on PAM, pluggable authentication modules, to manage how users log in and how credentials are checked.
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Linux also has a PROC file system under Flash PROC, a virtual directory that shows real-time information about processes and system hardware.
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Similarly, Slash Dev holds device files, which let software interact with hardware like disks, USBs, and sound cards.
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Kernel and system messages are stored in the dmesg log, which is useful for debugging hardware issues.
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If you want to compile programs yourself, Linux provides Make and GCC, tools that build software directly from source code.
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You can also run isolated applications using containers with tools like Docker or Podman, which package apps with their dependencies.
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For full machine-level separation, Linux supports virtualization through KVM and QEMU,
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allowing you to run entire operating systems inside Linux.
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Networking can go beyond SSH.
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Linux can share files with NFS or Samba, transfer data with SCP or RSYNC,
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and host services using web servers like Apache or NGINX.
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Monitoring networks is also possible, with tools like TCP dump and Wireshark, which capture packets for analysis.
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Linux distributions bundle all these concepts together differently.
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Some focus on stability, like Debian.
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Others on cutting-edge software, like Arch.
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And others on user-friendliness, like Ubuntu.
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Linux distributions also include a package called the kernel headers, which are needed when compiling drivers or certain software.
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When working with software across different environments, you can use package formats like .deb,
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debian slash ubuntu, or .rpm, Thedora slash Red Hat, to install programs manually.
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For even more flexibility, tools like Flatpak,
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Snap, and AppImage allow applications to run across many distributions, without compatibility issues.
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Linux also relies heavily on System D services, which can be started, stopped, enabled, or disabled to control background tasks.
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To see what's happening during startup, you can use System D Analyze to check boot performance.
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If If the system fails to boot properly, you can use Recovery Mode or a Live USB to repair files and restore access.
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For user interaction, Linux desktops run on display servers like X11 or Wayland, which handle graphics output.
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Above that sits a desktop environment such as Noom, KDE or XFCE, which provides the graphical interface users interact with.
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Another key concept is shell built-ins, commands built into the shell itself, like CD or Echo, which run faster than external binaries.
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You can also use aliases to create shortcuts for long commands, making your workflow faster.
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For more advanced workflows, Linux supports bash functions, allowing you to define reusable custom commands directly in your shell.
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Linux also treats everything as a file, including hardware, processes, and sockets,
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which is why directories like slash sys exist to expose kernel and device information.
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Finally, Linux systems use init-ramfs, a small temporary root file system loaded into memory during boot,
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which helps the kernel load drivers before the main file system is mounted.

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À propos de cette leçon

Vous vous entraînez en anglais avec "Every LINUX Concept Explained in 8 Minutes." en utilisant la technique du Shadowing.

Qu'est-ce que la technique du Shadowing ?

Le Shadowing est une technique d'apprentissage des langues fondée sur la science, développée à l'origine pour la formation des interprètes professionnels. Le principe est simple mais puissant : vous écoutez de l'anglais natif et le répétez immédiatement à voix haute — comme une ombre suivant le locuteur avec un décalage de 1 à 2 secondes. Les recherches montrent une amélioration significative de la précision de la prononciation, de l'intonation, du rythme, des liaisons, de la compréhension orale et de la fluidité.

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