Tag: linux

What is lost+found and why does it exist? fsck puts recovered file fragments there after a crash, and no, you can't delete it.

echo is convenient but inconsistent across systems; printf is portable and precise, know when to use each and avoid the gotchas.

grep is more powerful than you think, regex patterns, context flags, recursive search, and piping tricks that save hours of log digging.

AV vs EDR, traditional antivirus signatures vs behavioral endpoint detection. What each catches, what it misses, and what you actually need.

Running new hardware on Ubuntu LTS? The HWE kernel backports newer kernel and graphics support. Here's how to switch from generic to HWE safely.

The Linux commands every sysadmin reaches for daily, file ops, process management, networking, and text manipulation you can't live without.

Apt says packages have been kept back during upgrade. What the message means on Debian 12 and Ubuntu, why it happens, and how to install those packages safely.

Upgrade one package with apt and leave the rest alone. The exact flag, why apt upgrade nginx upgrades everything, version pinning, and held package behaviour.

Move Docker images between hosts without a registry using docker save and docker load, air-gapped deployments made simple.

Use docker cp to move files between running containers and your host machine, no volumes needed for one-off file transfers.

Access services on the host machine from inside a Docker container using host-gateway or host.docker.internal, no hardcoded IPs.

Containers share the kernel; VMs have their own. Understand the isolation trade-offs, overhead differences, and when to use which.