> grep -r "Linux"▋

8 entries

On this wiki, Linux is the operating system behind every troubleshooting topic covered: systemd units that fail to start and how to read journalctl to fix them.[source]

Its scheduling tools (cron vs systemd timers) and its copy tools (rsync vs scp) are compared directly, and its networking stack has moved from legacy netstat to ss for port inspection.[source][source][source]

It is also the platform where GPU usage for Ollama is diagnosed — drivers, VRAM, backends, ROCm, Docker flags.[source]

Everyday Linux work here means logs via journalctl and shell tools like ssh, where publickey refusals are debugged with ssh -vvv.[source][source]

see also: systemd · DevOps · git · Ollama

auto-tended from 8 posts · every sentence cites its source · mortal on purpose

2026-09-28

Fatal: Not a Git Repository? The 60-Second Fix

The four real causes of fatal: not a git repository, ranked plus the one command that tells you which one you have before you touch anything.

2026-09-18

SSH Permission Denied (publickey): The Real Fix

SSH permission denied (publickey) means every key you offered was refused. The four real causes, the ssh -vvv checks that find yours, and the fixes.

2026-09-16

Ollama Not Using GPU? Fix It on Linux, Windows and WSL

Ollama ignoring your GPU and falling back to CPU? The five real causes — drivers, VRAM, pinned backends, ROCm, Docker flags — and the command that fixes each.

2026-09-14

Systemd Service Not Starting? How to Fix It

Systemd service not starting? Read journalctl the right way, fix the five causes behind most failures, and get the unit back to active in minutes.

2026-09-11

Cron vs systemd timers: which should you use?

Cron vs systemd timers compared: syntax, logging, catch-up runs and dependencies — plus a decision table so your next scheduled job lands in the right place.

2026-09-08

Rsync vs SCP: Which Linux Copy Command to Use

Rsync vs scp: rsync resumes a dropped transfer and copies only what changed — scp just copies. Speed numbers, the flags that matter, and when scp still wins.

2026-09-05

ss vs netstat: Which Linux Port Command to Use

ss vs netstat: netstat is legacy on modern Linux, and ss replaces it flag for flag. Get the mapping table, find the process behind any port, and a cheat sheet.

2026-09-02

journalctl Cheat Sheet: Tail, Filter and Follow Linux Logs

journalctl cheat sheet for real work: tail logs, grab the last 100 lines, follow a live service and filter by unit or time — copy-paste commands that just work.