Page 10 - Bash

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Generate HTML Reports Directly From Bash

Maxim Mironjuk - February 19, 2025

A cron job that runs overnight has to deliver a readable result by morning. Instead of scrolling through a log file, a Bash report builds a finished HTML page with tables, bars, and status badges directly, ready to send by mail or drop on an internal server, without PHP, Python, or a templating library.

Bash

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jq for JSON in Everyday Shell Work: Filter, Transform, Validate

Maxim Mironjuk - February 12, 2025

jq makes JSON in the shell first class. Once you master filters, select(), map(), has(), and type checks, pass variables safely with --arg, and handle errors with try/catch, you can process API responses, config files, and log data directly in Bash, with no detour through Python or Node.

Bash

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Using Arrays in Bash Instead of String Hacks

Maxim Mironjuk - February 11, 2025

String hacks in Bash, file lists as whitespace-separated strings, configuration values as comma-separated fields, break systematically as soon as a value contains a special character. Arrays in Bash are the clean alternative: indexed arrays for ordered lists, associative arrays for key-value structures, slices for subsets and safe iteration for every use case.

Bash Docker

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BusyBox ash Limits in Alpine Containers and How to Work Around Them

Maxim Mironjuk - February 08, 2025

An entrypoint script with arrays and process substitution runs fine locally and fails inside an Alpine container with exec format error. The reason is BusyBox ash, which serves as /bin/sh in the default Alpine image instead of Bash and offers only a fraction of the familiar feature set.

Bash Linux

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Tr: Practical Everyday Use Cases in the Shell

Maxim Mironjuk - January 31, 2025

tr is often seen as the simplest text tool in the shell and gets underrated because of it. Character classes, targeted deletion with -d and squeeze with -s make tr the fastest tool for input normalization, delimiter swapping and cleaning up control characters, often quicker to type and quicker to run than an equivalent sed command.

Bash

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Writing Scripts That Work in Both Bash and zsh

Maxim Mironjuk - January 28, 2025

Since macOS Catalina, zsh has been the default login shell, while servers and CI environments keep relying on Bash. Anyone writing a script or a dotfile function meant for both shells has to know array indices, globbing and option names that differ fundamentally.

Bash

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Processing Logs in Bash: grep, awk, sed and jq Working Together

Maxim Mironjuk - January 25, 2025

Processing logs in Bash means more than running grep and eyeballing the output. Time window filtering, structured error reporting, frequency analysis and combining grep, awk, sed and jq into efficient pipelines make the difference between reactive troubleshooting and proactive log monitoring.

Bash

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find, xargs and Null-Byte-Safe Workflows in Bash

Maxim Mironjuk - January 24, 2025

find and xargs are among the most widely used shell tools, and among the most frequently misused. The null-byte delimiter, correct parallelization and safe handling of arbitrary filenames are not niche topics; they are the foundation for Bash workflows that keep working reliably on production systems with real filenames.

Bash

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Interactive Bash Tools with select, read, Menus and Confirmations

Maxim Mironjuk - January 20, 2025

Good interactive Bash tools have a clear interface: numbered menus with select, input via read -r with timeout, colored status messages and confirmation dialogs that guard against dangerous actions. All of this is achievable with pure Bash builtins.

Bash Security/OWASP

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Fetching Vault Secrets in Bash Scripts

Maxim Mironjuk - January 18, 2025

A database password in a .env file or a pipeline variable is a secret that eventually ends up in a log, a backup, or a history file. Vault secrets that Bash scripts fetch, verify, and never persist anywhere close exactly that gap, including dynamic database credentials and automatic rotation.