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A project I want to work on requires Ruby. I was directed to RVM or rbenv. I tried rbenv first because it has Mac instructions, ran into failures, uninstalled it and installed RVM, and still ran ...
I'm still trying to solve my problem with installing Ruby on a new Mac, and some discussions are saying that I need to reinstall brew because of the change from the old chipset to the M1. (I'm jus...
If snap-store itself is preventing the update, it's straightforward: snap-store --quit sudo snap refresh snap-store But sometimes it might be something else, in which case the above solution w...
The solution is to use an associative array to store what you've already seen: #!/bin/bash unset seen declare -A seen for arg in "$@" do if [[ -z "${seen[$arg]}" ]] then ...
On a Linux system, a lot of files are installed from packages, many of which have different licenses (and sometimes different licenses for different files in the package). If I want to figure out ...
Here's an alternative that is a one-liner drop-in for your existing script: eval set -- $(printf "%q\n" "$@" | sort -u) It works by escaping the initial arguments, piping the escaped arguments ...
We are all Linux users and enthusiasts on this site, as well as caring about FOSS. Although technically this is a site for technical Q&A, I think some level of Linux activism is possibly benefi...
While * belongs to the POSIX standard, ** is an extension. You are right it's not in man 7 glob. Tools that treat ** specially (i.e. not as * simply followed by *) tend to agree what it means, but ...
This is an ideal case for ImageMagick. Given input.png: Running this command: convert input.png -draw 'fill yellow fill-opacity 0.5 polygon 50,50 100,30 150,50 100,150' output.png Produces ...
How to find the exact path to an executable file present in your PATH. I.e. commands you can call by just their names. E.g. what executable gets called when I type find and hit enter? $ hypotheti...
This blog post describes a privilege escalation, exploiting tar's --checkpoint-action option. The privilege escalation is used to solve a TryHackMe challenge. The root user calls tar via cron whi...
I'm having trouble visualizing exactly what your setup is like, but if I understand correctly, then: You have one client that you are connecting from You have one server that you are able to co...
There are keyboard shortcuts for navigation. Unfortunately they don't seem to be documented in help (at least I couldn't find an entry there), but you can see a list by typing ?. The red frame is ...
with pacman --debug We can display the mirrors that pacman uses with the --debug option. For example, when running pacman --debug -Sy, pacman will write lines like these to standard error: debug...
apt-mark aims to do this: the commands apt-mark showmanual and apt-mark showauto should show you respectively the packages which you explicitly installed and the ones which were added as dependenci...
Use xclip(1). For example: $ printf '%s' foo | xclip; And now Shift+Insert to paste. There's a primary selection, a secondary selection, and a clipboard selection, and you can chose between t...
My immediate reaction would be that yes, it can definitely fit in the general Q&A category. And there is no rule against self-answers to questions. However, please do take a bit of care with h...
I certainly think "how to do X" is perfectly good for a question on Codidact, so long as X is sufficiently focused. A well-explained overview of a system is also useful, given it contains enough in...
If I had a fast drive (SSD) and a slow one (HDD), what parts of my Linux system should go on the fast one?
My understanding is that one of the key advantages of Linux is modularity: the actual Linux kernel is quite small, and then what we call Linux is that plus the "rest of the system" - hence "operati...
Richard Stallman wants you to use GNU/Linux to refer to the combination of OS and kernel that people typically call Linux. I am not a Stallman partisan one way or the other, but I think noting his ...
An exclamation mark followed by space in the beginning of a pipeline will negate the final exit code of the pipeline. Here's an example in Bash. Echoing $? will print out the exit code of the prev...
Suppose I want to limit what characters are allowed in filenames. For example, I want file creation to fail if there is a \n in the name. Is there a way to enforce this? If it matters, I prefer a...
I'm using the Gnome System Monitor in Linux Mint. Whenever I attempt to "End" or "Kill" a process, I am given this warning via a modal dialog (emphasis mine): Killing a process may destroy data,...
Sometimes I share Unix commands online, and people chastise me for "useless use of cat" (UUOC) or "cat abuse". My cat is quite comfy and doing very well, thank you. What are they talking about?
