One dev problem solved per week.
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Short, practical guides for backend developers and sysadmins. One concept per guide, the mistake people make, and the exact fix. Delivered every Monday. Archive grows forever.

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rsync trailing slash: what it actually copies

Why rsync source/ dest/ copies the contents of source into dest, but rsync source dest/ copies the source folder itself.

rsync · linux · backup — beginner

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Free

curl: why your POST works in bash but not in a script

Single-quoted JSON in a shell script silently breaks when the data contains an apostrophe. The fix is one flag.

curl · bash · http — beginner

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Free

Docker: why your image rebuild ignores your code change

Docker's layer cache invalidates only when the instruction or its inputs change. Copy package manifests before source.

docker · dockerfile · build — intermediate

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FAQ

What topics do you cover?
Linux, web infrastructure, DNS, TLS, Redis, systemd, Nginx, Postgres, Docker, shell scripting, rsync, cron, SSH, backups, and other backend/ops topics — the tools you actually run on servers. No frontend frameworks.
How long is each guide?
One page. The Problem. The Mistake. The Fix. Why It Works. Copy-Paste. Next Steps. Most guides fit in under 10 minutes.
Can I cancel?
Yes — card subscriptions cancel via Polar's customer portal; YEM subscriptions simply expire at the end of the paid period. You keep access until the end of the paid period.
Do you offer refunds?
Yes — full refund within 14 days of any charge, no questions asked. Cancel any time via Polar's customer portal. See the refunds policy.
Is there a free tier?
Three guides are free to read, no account needed. Subscribing gets you a new guide every week plus the full back catalogue.
Who writes these?
Steve Hodgkiss — 40+ years of backend and infrastructure work. stevehodgkiss.net

Prefer books? Short, practical ebooks on Linux, Git, Docker, MySQL and more — same author, one concept per page. books.stevehodgkiss.net