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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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What are some of your most useful or favorite terminal commands? (piefed.social)

submitted 1 week ago by marighost@piefed.social to c/linux@lemmy.ml

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I've been setting up a new Proxmox server and messing around with VMs, and wanted to know what kind of useful commands I'm missing out on. Bonus points for a little explainer.

Journalctl | grep -C 10 'foo' was useful for me when I needed to troubleshoot some fstab mount fuckery on boot. It pipes Journalctl (boot logs) into grep to find 'foo', and prints 10 lines before and after each instance of 'foo'.

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[–] jim3692@discuss.online 2 points 6 days ago (1 children)

docker run --rm -it --privileged --pid=host debian:12 nsenter -a -t1 "$(which bash)"

If your user is in the docker group, and you are not running rootless Docker, this command opens a bash shell as root.

How it works:

docker run --rm -it creates a temporary container and attaches it to the running terminal
--privileged disables some of the container's protections
--pid=host attaches the container to the host's PID namespace, allowing it to access all running processes
debian:12 uses the Debian 12 image
nsenter -a -t1 enters all the namespaces of the process with PID 1, which is the host's init since we use --pid=host
"$(which bash)" finds the path of the host's bash and runs it inside the namespaces (plain bash may not work on NixOS hosts)

[–] noughtnaut@lemmy.world 2 points 5 days ago (1 children)

So you're running bash "as if you're on the host systen". What's the benefit?

[–] jim3692@discuss.online 1 points 5 days ago

I just wanted to show how Docker can be abused for privilege escalation, when it's not properly configured