Page 3 - Bash

Bash

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Shell Scripts for Deployments: Checklists, Guards and Rollbacks

Maxim Mironjuk - March 09, 2026

A deployment script without checklists deploys even when the build is broken. Without guards, a second deployment runs in parallel with the first. Without a rollback mechanism, a failed deployment turns into a manual emergency. Professional shell scripts for deployments solve all three problems, using simple, maintainable Bash patterns.

Bash Linux

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macOS vs Linux: Bash Version Traps and Coreutils Differences

Maxim Mironjuk - March 08, 2026

A script using mapfile or sed -i runs fine on the Linux server and breaks on a colleague's MacBook. The reason is the outdated Bash 3.2 that ships with macOS and the different coreutils Apple provides for licensing reasons.

Magento Bash Docker PHPStorm

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Terminal in PHPStorm: When It's Enough and When an External Shell Is Better

Maxim Mironjuk - March 06, 2026

The integrated terminal in PHPStorm is sufficient for most everyday tasks: Magento CLI, Composer, Git commands. But it has limits: no persistent session management, no tmux, no full multiplexing. This article explains when the integrated terminal is enough and when an external shell is more productive.

Bash Docker

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Multi Environment Config Generator with Bash Templates

Maxim Mironjuk - March 04, 2026

A config generator replaces hand maintained copies of .env files and server configurations with a single template per format, combined with clearly separated variables per environment. This article shows how to build such a config generator with envsubst, strict secrets separation, and a validation stage in Bash, so development, staging, and production never drift apart again.

Bash Linux

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Awk for Multi-Column Reports and Aggregation in the Shell

Maxim Mironjuk - March 02, 2026

Grouping a log file with a hundred thousand lines by status code, calculating totals per customer, or building a formatted report from raw CSV: awk does all of that without Python, without a database, right inside the pipe. Fields, associative arrays and BEGIN/END blocks turn it into a full featured reporting tool.

Bash

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Writing Robust Bash Scripts: set -euo pipefail, Traps, and Exit Codes

Maxim Mironjuk - February 27, 2026

Many shell scripts fail silently: a command returns exit code 1, the pipeline keeps going, and monitoring sees nothing. set -euo pipefail, ERR traps with LINENO, and clean exit codes are the foundation of every Bash script that needs to run reliably in production and react instantly and traceably when something goes wrong.

Bash Security/OWASP Linux

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Using SSH Multiplexing with ControlMaster in Automation

Maxim Mironjuk - February 25, 2026

Anyone connecting via SSH to the same server ten or twenty times in a row inside a deployment script pays the full price of a TCP handshake, key exchange and authentication every single time. ControlMaster shares a single established SSH connection over a local Unix socket with every further call, making Bash automation noticeably faster.

Bash

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Local vs. Global Variables in Nested Bash Functions

Maxim Mironjuk - February 22, 2026

Bash functions share a single global namespace by default, every variable is global unless explicitly declared with local. Anyone unaware of this ends up having a helper function accidentally overwrite a variable in a completely different function, a bug that usually only becomes visible once two functions happen to use the same variable name like i or result.

Bash Linux

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Locking in Bash: flock, PID Files and Race Conditions

Maxim Mironjuk - February 15, 2026

Bash scripts that run without locking in cron jobs or deployment pipelines risk race conditions when executed more than once. PID files are common but not atomic. flock offers kernel backed locks that are released automatically even after a crash, making it the right tool for reliable locking in shell scripts.

Bash Linux

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Bash Job Control: fg, bg and disown Explained

Maxim Mironjuk - February 10, 2026

Job control is far more than Ctrl-Z followed by a quick bg. Understanding how Bash manages jobs, process groups and signals lets you run long migrations, backups and maintenance tasks in the background without a dropped SSH session dragging all that progress down with it.