Bash Script Skill

When to use

• •New Bash scripts.
• •Existing Bash scripts that need updates.

Mandatory rules

• •Use Bash (#!/usr/bin/env bash), never POSIX sh.
• •Header must include purpose and usage examples.
• •Use emoji logs for runtime states.
• •Prefer early return and guard clauses.
• •Keep logic straightforward and readable.
• •Do not add unit tests unless explicitly requested.

Minimal template

#!/usr/bin/env bash
#
# Purpose: {description}
# Usage examples:
#   ./{script_name}.sh --help

set -euo pipefail

log_info() { echo "ℹ️  $*"; }
log_warn() { echo "⚠️  $*"; }
log_success() { echo "✅ $*"; }
log_error() { echo "❌ $*" >&2; }

Validation

• •bash -n
• •shellcheck -s bash (if available)