shell-scripting

Write bash scripts safely by enforcing a strict mode (set -euo pipefail), using proper shebangs, quoting variables correctly, validating inputs, checking for required variables, and handling errors explicitly. ShellCheck linting catches common mistakes automatically before runtime.

Common bash security risks include unquoted variables, missing error handling, unsafe array operations, and unchecked user input. Defensive programming patterns—mandatory variable checks, input validation, safe function definitions, and proper quoting—eliminate these vulnerabilities in scripts under 100 lines.

Bash is well-suited for deployment automation, orchestrating other programs, and simple build pipelines. This approach works for scripts that coordinate tools and handle straightforward workflows, avoiding complex logic and data structures where other languages perform better.

ShellCheck is a linting tool that automatically detects bash scripting errors and anti-patterns. Run it against your script to catch bugs before execution and ensure compliance with modern shell scripting standards and safety guidelines.

A reliable bash script template includes a proper shebang (#!/bin/bash), strict mode flags (set -euo pipefail), input validation, error handling with exit codes, quoted variables, required variable checks, and safe array handling patterns ready for immediate use.

Avoid bash for scripts requiring complex business logic, nontrivial data structures, or extensive conditional workflows. For these cases, use a general-purpose programming language; bash excels at orchestration, small utilities, and straightforward automation under 100 lines.