Linux
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50 free Linux trivia questions with answers — science & nature quiz, new questions added Oct 2026.
Linux began as one student's hobby project and now runs most of the world's web servers and smartphones, usually without the people using it ever noticing. That mix of volunteer origins and enormous reach makes it one of the best trivia subjects in computing, full of in-jokes, strong opinions and names with stories behind them. This quiz covers the ground a Linux user actually walks: the history of the kernel and the people behind it, the best-known distributions, the everyday commands of the command line, the standard folder structure of the file system, and how ownership and permissions decide who may do what. It suits newcomers checking what they have picked up, students revising for a course or a certification, and old hands who want to see whether the stories behind the tools have stayed with them. Every answer comes with a short explanation, so a wrong guess still teaches something.
30 of 50 questions with answers and explanations. Play the quiz
Q 01Tux, the Linux mascot, is which kind of animal, chosen after Linus Torvalds said one bit him in Canberra?
Penguin
A penguin was announced as the mascot in 1996. The name Tux nods both to Torvalds' UniX and to the tuxedo the bird appears to wear.
Q 02Which smartphone operating system is based on a modified Linux kernel but ships without the usual GNU software?
Android
Android pairs the Linux kernel with Google's own userland, including a C library called Bionic, instead of the GNU one.
Q 03In which Nordic country was Linus Torvalds a university student when he began writing the Linux kernel?
Finland
Finland has a Swedish-speaking minority that includes the Torvalds family, which makes Sweden the usual wrong guess. He attended the University of Helsinki from 1988 to 1996.
Q 04In November 2017, Linux became the only operating system left on the TOP500, a twice-yearly ranking of which machines?
Supercomputers
Supercomputers on the list have all run Linux since the last two holdouts, IBM machines running AIX, dropped off that month.
Q 05Which NASA helicopter, the first aircraft to make a powered flight on another planet, ran a Linux operating system?
Ingenuity
Ingenuity ran Linux on a Qualcomm Snapdragon 801 processor. Planned for only five flights on Mars, it completed 72.
Q 06Which Microsoft boss said in 2001 that Linux was 'a cancer' in the intellectual property sense?
Steve Ballmer
Steve Ballmer changed his stance in 2016, saying he supported his successor Satya Nadella's open-source commitments.
Q 07Which version-control system did Linus Torvalds write in 2005 after Linux kernel developers lost free use of BitKeeper?
Git
Git is British slang for an unpleasant person, and Torvalds joked that he names all his projects after himself.
Q 08Which Linux distribution is named after a Nguni philosophy often translated as 'humanity to others'?
Ubuntu
Ubuntu was named by its founder, Mark Shuttleworth, for his South African roots and to emphasize community.
Q 09Which keyboard shortcut stops a running command in a Linux terminal by sending it the SIGINT signal?
Ctrl+C
Ctrl+C makes the active program receive SIGINT, the interruption signal. A program can catch it to tidy up first, but most simply quit.
Q 10Which credit-card-sized British computer, created to teach computing in schools, runs Linux as its recommended system?
Raspberry Pi
The Raspberry Pi went on sale in 2012 for $35 and later passed the ZX Spectrum as the best-selling British computer of all time.
Q 11Which teaching operating system by Andrew Tanenbaum was Linus Torvalds using when he began to write the Linux kernel?
Minix
Minix's creator opened a famous 1992 newsgroup thread titled 'LINUX is obsolete', arguing that a monolithic kernel was a giant step back into the 1970s.
Q 12Which programmer launched the GNU Project in 1983, whose free tools were later combined with the Linux kernel?
Richard Stallman
Richard Stallman argues that the combined system should be called GNU/Linux, to credit the project whose software surrounds the kernel.
Q 13What name did Linus Torvalds want for Linux before an FTP server administrator renamed the project without asking him?
Freax
Q 21Which two-letter Linux command lists the files in a directory, the job that dir does in MS-DOS?
ls
The ls command is short for 'list', a name inherited from the earlier Multics system. With no path given, it shows the files of the working directory.
Q 22Which Linux command changes the working directory and is built into the shell instead of being a separate program?
cd
The cd command has to live inside the shell: a separate program would run as a child process, which is normally prevented from changing its parent's state.
Q 23Which three-letter Linux command prints the full path of the working directory to the terminal?
pwd
The pwd command is short for 'print working directory'. Its ancestor on the Multics system was the short name of a command called print_wdir.
Freax blended 'free', 'freak' and the letter x. Ari Lemmke, who helped run the server, thought it a poor name and filed the code under 'Linux' instead.
Q 14Which copyleft terms, replacing a ban on commercial distribution, have covered the Linux kernel since 1992?
General Public License
The General Public License lets anyone sell or change the kernel, provided their changes are shared on the same terms. Torvalds called the switch 'definitely the best thing I ever did'.
Q 15Which chip maker did Linus Torvalds call the single worst company the Linux kernel developers had dealt with?
Nvidia
Nvidia drew the insult, delivered with a raised middle finger, during a 2012 talk Torvalds gave at Aalto University.
Q 16Which Linux distribution, founded by Ian Murdock in 1993, names every release after a Toy Story character?
Debian
Debian keeps its permanently unstable branch under the name Sid, after the neighbourhood child who destroys toys.
Q 17Which North Carolina open-source company, known for its enterprise Linux, did IBM agree to buy for $34 billion?
Red Hat
Red Hat is named for a red Cornell lacrosse hat that co-founder Marc Ewing wore at university, a gift from his grandfather.
Q 18Which rolling-release Linux distribution, begun by Judd Vinet, installs software with a tool called Pacman?
Arch
Arch Linux puts simplicity of design ahead of polished point-and-click tools, so even Pacman has no official graphical front-end.
Q 19Which free image editor did Larry Ewing use in 1996 to draw Tux, the mascot of Linux?
GIMP
GIMP was at version 0.54, its first public release, when Ewing drew his contest entry. His only condition for reuse was a credit for himself and the program.
Q 20Which handheld gaming computer, released in 2022, runs Windows games on Linux through a layer called Proton?
Steam Deck
The Steam Deck followed Valve's earlier Steam Machines, whose shortage of Linux games led the company to invest in Proton.
Q 24Which Linux search command began as a private tool of Ken Thompson's and prints every line matching a pattern?
grep
The name grep comes from g/re/p, an instruction in the ed editor that stands for global, regular expression, print.
Q 25Which Linux command shows the reference page for another command, cited in forms such as ftp(1) or printf(3)?
man
The man command formats each page and hands it to a pager program for display. The number in brackets names the section of the manual the page sits in.
Q 26Which Linux command lets a permitted user run one command as the administrator after entering their own password?
sudo
The sudo logo nods to an xkcd comic strip in which an order for a sandwich is accepted only once the word is put in front of it.
Q 27Which Linux command writes one file to the screen, or several files end to end in the order given?
cat
The cat command gets its name from catenate, a variant form of concatenate. Naming just one file, so that its content shows on the monitor, is a common use.
Q 28Which Linux command deletes files and, given the options -rf, removes whole directory trees without asking first?
rm
The rm command only unlinks a file instead of wiping it, so the data can sometimes be recovered with specialized tools. There is no recycle bin to fall back on.
Q 29Which Linux command sends a signal, by default SIGTERM, to a running process identified by its PID number?
kill
The kill command is something of a misnomer: its default signal merely requests that the process exit, and other signals have nothing to do with ending anything.
Q 30Which Linux archiving command was originally developed for magnetic tape, a storage medium with no file system?
tar
The name tar is short for 'tape archive'. A file it writes is nicknamed a tarball, and it records each file's ownership, timestamps and permissions.