sd vs sed: Find and Replace Without the Escaping
sd does one job — substitution — with modern regex syntax, no delimiter to choose and no BSD-vs-GNU differences. Where it helps, and the large part of sed it deliberately…
delta vs diff: Making Changes Readable
delta does not compute diffs — it renders them, with syntax highlighting, line numbers and a side-by-side view. What to put in your gitconfig, and why diff is still what…
zoxide vs cd: Jumping Instead of Navigating
zoxide remembers the directories you actually use, so one fragment gets you there from anywhere. What it changes, why cd is still what scripts must use, and the setting that…
restic: Backups That Deduplicate, Encrypt and Verify
One binary, an encrypted repository on almost any storage, and snapshots that only store what changed. What restic is good at, the retention policy that actually frees space, and when…
systemd Beyond Services: Units, Targets and Dependencies
systemd manages units, and services are only one kind. Sockets, mounts, targets and slices explained — plus the difference between requiring something and waiting for it, which is behind most…
How Packages and Dependencies Actually Work
What a package contains, how a repository is indexed and trusted, why shared library versions are the real reason dependencies exist, and what mixing sources does to a system.
Containers: What Is Actually Happening
A container is an ordinary Linux process with a restricted view of the system. Namespaces, cgroups and overlay filesystems explained — and the problems that stop being mysterious once you…
What the Kernel Actually Does
Linux is the kernel — not the distribution around it. What lives on each side of the userspace boundary, how to watch a program ask for something, and why an…
Shell History — Stop Retyping Commands
Ctrl+R, history expansion, the readline editing keys worth learning, and the configuration that stops your history vanishing every time you close a terminal.
User Management — useradd, usermod, passwd and chage
Creating accounts, adding someone to a group without wiping the groups they already had, password ageing with chage, and why locking an account beats deleting it.