Tag: Bash

1. Sed: Multiline Substitutions with Hold Space and Pattern Space

   Dec 1, 2025

   Anyone who only uses sed line by line with s/old/new/ quickly hits a wall with config blocks, XML fragments and multiline log entries. Hold space and pattern space give sed the ability to look at several lines at once and replace them as one connected block, without ever reaching for Perl or Python.

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2. Automating DNS Lookups with dig and host in Bash

   Nov 22, 2025

   Anyone who only checks DNS records one at a time by hand misses propagation problems and silent changes. Automating DNS lookups with dig and host processes domain lists in seconds, compares resolvers, and catches configuration mistakes before customers report them.

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3. SSH in Automation: known_hosts, Agent, Keys, and Security

   Nov 20, 2025

   Using SSH correctly in automation scripts is trickier than it looks: disabling StrictHostKeyChecking solves the first connection problem, but it opens the door to man in the middle attacks. This article shows how SSH automation works without compromising security.

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4. Improving the Performance of Bash Scripts

   Nov 5, 2025

   A shell script that spawns a thousand external processes for a thousand files isn't a performance problem, it's a design problem. Anyone who understands how much a fork costs, which operations builtins already cover, and how caching works in the shell writes scripts that take seconds instead of minutes.

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5. Automating Docker and Kubernetes Workflows with Bash

   Oct 20, 2025

   Container tooling like Docker and Kubernetes ships with powerful CLIs, but only Bash automation ties health checks, rollout control and alerting into a complete workflow. Teams that automate Docker and Kubernetes workflows with Bash cut down on manual intervention and make deployments traceable, repeatable and safe.

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6. Production Bash Checklist: Security, Robustness, Logging, and Tests

   Oct 19, 2025

   Shell scripts rarely survive code reviews without objections, because standardized checklists are simply missing. This Bash checklist covers all critical dimensions: security, error handling, logging, testability with BATS, and static analysis with ShellCheck, systematically and with a practical focus.

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7. bashdb Debugger: Step by Step Bash Script Debugging

   Oct 14, 2025

   Anyone who investigates a broken Bash script only with scattered echo lines wastes time and loses overview. The Bash debugger bashdb brings breakpoints, watchpoints and call stack analysis into the shell and makes debugging complex scripts as traceable as in any other programming language.

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8. Running Bash Scripts as a Proper Daemon

   Oct 9, 2025

   Starting a script in the background with & does not make it a daemon. A true daemon detaches completely from the terminal, prevents double starts through a PID file, reacts in a controlled way to signals like SIGTERM and SIGHUP, and writes its log somewhere that stays reachable even without a terminal.

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9. Implementing Rate-Limited API Requests with Retry in Bash

   Oct 2, 2025

   A script that simply aborts on the first 429 response is not automation, it is a ticking time bomb. Rate-limited API requests with retry in Bash respect Retry-After headers, use exponential backoff with jitter, and deliver reliable results even under strict API limits.

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10. Combining JSON, YAML and .env Files in Shell Workflows

    Sep 27, 2025

    Modern infrastructure delivers configuration in JSON, YAML and .env files at the same time. Anyone merging these formats in shell workflows needs robust loading, validation and export patterns, otherwise missing fields, unsafe variables and format inconsistencies turn into a silent risk in deployment pipelines.

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