Save JSON from a cron job or GitHub Action
Save a JSON result from a scheduled job to a stable URL, then read it from a static page or another script. This guide uses jstash JSON Bins for a s…
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My photo.jpg Was a 29-Byte HTML Page: Validating Downloaded Images Before They Reach Production
We publish a handful of technical articles every day on our company blog, and every article gets two real photographs: a cover and one inline image.…
Ctrl-C won't stop a bash loop if the program inside it catches the signal
Most people have at some point hammered Ctrl-C at a terminal while a shell loop carried on regardless, one iteration after another, and put it down…
A Command That Matched Zero Files Still Exits 0: How to Catch Silent CI Failures
A Command That Matched Zero Files Still Exits 0: How to Catch Silent CI Failures Every engineer has felt the cold dread of pushing a critical fix, w…
Jira 32,767 characters limit: find the description and comment data a JCMA migration lost
Jira 32,767 characters limit: find the description and comment data a JCMA migration lost Key takeaways END STATE: a reviewed JSON plan and a dry-ru…
Nightly backups with rsync hard links: three snapshots cost 1.4 MB where copies would cost 3.5 MB
Disclosure first I sell the five-line core of this post for $4 as snapshot.sh , part of DevToolkit ( https://payhip.com/b/aEn8M ), so I am not neutr…
Learning Notes
Note: These are my learning notes from my current phase. I am keeping them as I wrote them so I can look back and see my progress. watched a 1 hour…
How to Automate Git Add, Commit, and Push with a Bash Script
How to Automate Git Add, Commit, and Push with a Bash Script I automated one of the repetitive tasks in my development workflow. While working on a…
Get your public IP, VPN/proxy status and risk score with one curl command
Most "what's my IP" sites are built for browsers. Call them from a script and you get a full HTML page back, or you're asked to sign up for an API k…
Свой VLESS-прокси бесплатно одной командой: Xray + XHTTP на Alwaysdata
Мне был нужен свой прокси за границей, но платить за VPS ради него не хотелось. Бесплатные варианты быстро кончились. Oracle Cloud просит иностранну…
4 Days, 3 Wasted Calls Per Run: My Retry Loop Mistook a Quota-Limit Message for a 'Too Short' Article
Last time I wrote about using a probe to decide which jobs to stop first when the quota runs dry . This post is about the problem sitting right next…
The day a script needs changing everywhere
At a previous employer I went looking for a shell script and found eleven of it. Not eleven copies, but eleven variants, each one someone's improvem…
One Line of mv Kills the 4x Duplicate Run After Recovery: Making launchd Queue Processing Idempotent
Six months ago my side business made ¥0 a month. This month it's ¥1.2M, running on an autonomous setup built with Claude Code. And here's the thing…
Why Claude Code keeps writing shell commands that fail on your Mac
Disclaimer: AI helped me write this since I am not that good with words :) Claude wrote this, mid-task, while refactoring something unrelated: sed -…
3 Weeks of Silent Failure: How One Missing `--model` Flag Drained My Interactive Quota Across 4 Jobs
I went from ¥100k a month as a student to ¥600k juggling side gigs, then to ¥0 after a layoff—and six months of building an autonomous Claude Code e…
The shell one-liners everyone pastes but nobody explains
You copy a command from a Stack Overflow answer, a blog post, or an AI assistant. It has six stacked flags. It works. You move on — without ever rea…
Alt-g and Readline shortcuts that make Bash completion a bit more convenient
Let's say you're using Bash and you have a directory like this: $ ls aaa-bbb-ccc You want to move to this directory, but you only remember bbb in th…
Wi-Fi Was Dead for 5 Hours While Chrome Kept Working: 4,960 DNS Failures and the 5-Minute Probe That Catches Them
Last time I wrote about how many jobs you should re-run the moment your quota comes back . This post goes back a few days earlier, to a quieter and…
Turn Your Android Phone Into a Local Development Server With Termux
You don't always need a computer to test a website or run a small development project. With Termux , your Android phone can run a local development…
For Months My Dev Server Came Up on 3001. Tonight I Found Out Who Had 3000.
A listener nobody remembered starting held port 3000 on my own machine since spring. One ss flag named the owner without root — and showed why 'list…
Never Name a zsh Loop Variable path: Three Deploy-Verification Traps That Looked Like Outages
In one day of post-deploy verification I hit three failures that all looked like "production is broken" and none of which were: zsh's tied path arra…
Quick tip: How to find and free up disk space in Linux
A full disk is a common reason for random service crashes in Linux. Here is a quick 3-step checklist to find and fix it: Check disk usage Find which…
The shell step that could not fail no matter what we did to it
Our integration suite had been green for eleven weeks. That is not a boast, it is the symptom. A colleague onboarding to the repo wrote a deliberate…
47GB of Compressed Memory and No Permission to Kill It: Handing a Monitoring Script Exactly One Root Command
Last time I wrote about picking out and reaping only the "orphaned Chrome" processes . This time it's the monitoring script sitting right next to it…
12 Pitfalls I Hit Auto-Logging Claude Code Subagents with a Stop Hook (and How the Numbers Cut My Weekly Cost 15–20%)
I had a gut feeling that my general-purpose subagent was the slow one. Then I measured it: 18 seconds on average, faster than Explore at 22. The rea…
5 Verbal Corrections Didn't Stick, So a 46-Line Stop Hook Made the Mistake Physically Impossible
I corrected the same Claude Code mistake more than five times. It never stuck. Then I replaced the correction with a 46-line shell script, and the m…
10 Terminal Productivity Tips That Actually Save Time
Introduction We all spend a chunk of our day in the terminal. Whether you're a seasoned developer or just starting, small tweaks can compound into m…
Display graphics without the use of Wayland or XOrg
As I was looking on the Suburban Railway I noticed that was using Linux: That made me think can I draw graphics or display anythink in Linux without…
How I Built a Server Health-Check & Slack Alerting Script Using Only Bash
In this tutorial, we will build a simple bash script that monitors server health and sends alerts to Slack via a webhook. The script checks four thi…
19 Audit Nags in One Night: Making a Claude Code Stop Hook Detect Unattended Sessions
My autonomous setup earns its keep precisely because Claude Code starts on its own and finishes on its own. The thing that nearly broke that setup w…