Bash Scripting Best Practices: Write Maintainable Shell Scripts in 2026

Poorly written scripts cause more outages than they prevent.

Strict Mode

#!/usr/bin/env bash
set -euo pipefail

Error Handling

cleanup() {
    local exit_code=$?
    rm -f "$TEMP_FILE"
    exit "$exit_code"
}
trap cleanup EXIT ERR

die() { echo "ERROR: $*" >&2; exit 1; }

Structured Logging

log_info()  { echo "[$(date)] [INFO]  $*"; }
log_error() { echo "[$(date)] [ERROR] $*" >&2; }

Argument Parsing

while [[ $# -gt 0 ]]; do
    case "$1" in
        -e|--environment) ENVIRONMENT="$2"; shift 2 ;;
        -v|--verbose)     VERBOSE=true; shift ;;
        -h|--help)        usage; exit 0 ;;
        *)                die "Unknown: $1" ;;
    esac
done

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