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today's howtos
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Linux Host Support ☛ How to Install and Optimize PostgreSQL on Ubuntu 26.04 for High Performance Web Apps
PostgreSQL is a powerful, open-source object-relational database management system known for its reliability, feature robustness, and performance. It powers everything from small web applications to large-scale enterprise platforms, offering advanced features such as Hey Hi (AI) compliance, JSON/JSONB support, full-text search, and powerful indexing options.
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Peter Hofmann ☛ `cp`: `-r` or `-R`?
A question like this recently came up again. I once tried to find an answer, but only posted it in some "forum" a decade ago, and I think it's worth saving this little bit of trivia from digital nirvana.
Nowadays, there's no difference between the two options in GNU coreutils. The current manual page says: [...]
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validate_script_output over grep
In OpenQA one has often to check the output of a command. Now most of us think foremost “this is a task for my beloved
grep”: [...] -
Linux Handbook ☛ Command Conqueror
Ten GNU/Linux command line puzzles, from hidden files to SUID privilege escalation. Free, no account needed, runs in Docker on your computer.
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Linux Handbook ☛ Link Your CTF Handle to Your GNU/Linux Handbook Account
Link your GNU/Linux Handbook CTF handle to your account to keep it on every computer and unlock members-only games.
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Linux Handbook ☛ Linux CTF Challenges
Free capture-the-flag games that test your GNU/Linux command line skills. No account needed. The levels run in Docker on your own computer.
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[Old] Wayne Pollock ☛ Unix File and Directory Permissions and Modes
Unix and Linux systems (including Mac OS X and other POSIX compliant systems) have a (relatively) simple system for controlling access to files and directories. This system is defined in POSIX.1:2008 standard external link, also known as the Single Unix Specification (SUS version 4). And since devices such as disks, ports, etc. have file names (under /dev) you control access to them the same way. (Note Windows systems up through Windows ME don't support permissions, just a "read only" attribute.)
This systems works by assigning a user and a group to every file. Then users of that file are put into one of three classes: [...]
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HowTo Geek ☛ 4 Linux terminal tricks that make boring jobs weirdly satisfying
You do some tasks in the Linux terminal so often that you never even bother to look for easier ways to do them. While looking for Linux tricks for time-saving and productivity, I found some hidden gems that I'm sure you'll find useful every day in your terminal sessions.
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HowTo Geek ☛ Stop treating your daily-driver Linux PC like a science experiment
Linux has a somewhat contradictory reputation. On the one hand, it's known as a rock-solid operating system that never goes wrong and offers countless hours of uptime. On the other hand, it's also known for being easy to break in the wrong hands when you start digging around under the hood.
Both of these can be true, but your personal Linux PC that you use every day should be more from column A than column B!