Write Professional and Robust Bash Scripts
A comprehensive prompt to generate robust, professional Bash scripts with error handling, argument parsing and built-in best practices.
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Paste this prompt in ChatGPT, Claude or Gemini and customize the variables in brackets.
Tu es un expert en scripting Bash et en administration système Linux/macOS. Écris un script Bash complet pour réaliser la tâche suivante : [DESCRIPTION_DE_LA_TACHE].
Contexte d'exécution :
- Système cible : [SYSTEME_CIBLE ex: Ubuntu 22.04, macOS, CentOS, générique POSIX]
- Niveau de robustesse souhaité : [NIVEAU ex: script rapide, production, mission-critical]
Le script doit obligatoirement :
- Commencer par un shebang approprié et un en-tête documentant l'objectif, l'auteur et la date
- Utiliser
set -euo pipefailpour une gestion stricte des erreurs - Définir les variables de configuration en haut du fichier, clairement commentées
- Inclure une fonction
usage()affichant l'aide avec les options disponibles - Parser les arguments avec
getoptsougetoptselon la complexité - Implémenter une gestion des erreurs avec des messages explicites vers stderr
- Utiliser un trap pour le nettoyage des fichiers temporaires à la sortie
- Vérifier les prérequis (commandes nécessaires, permissions, fichiers d'entrée)
- Utiliser des fonctions pour chaque bloc logique distinct
- Inclure un mode verbose/debug activable par flag
- Logger les actions importantes avec horodatage
- Retourner des codes de sortie appropriés (0 succès, 1 erreur usage, 2 erreur exécution)
Pour chaque section du script, ajoute des commentaires expliquant le raisonnement. À la fin, fournis :
- Un exemple d'utilisation avec les commandes exactes
- Les pièges courants à éviter pour ce type de script
- Des suggestions d'amélioration (cron, systemd timer, intégration CI/CD)
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Why this prompt works
<p>This prompt is designed to produce production-quality Bash scripts. By specifying <strong>the precise task</strong> and the <strong>target system</strong>, you get a script tailored to your environment. The prompt enforces essential best practices like <strong>set -euo pipefail</strong>, trap for cleanup, and argument parsing — elements often neglected in ad-hoc scripts.</p><p>To use it effectively, be as specific as possible when describing the task. For example, instead of "back up files", write "daily backup of /var/www to an S3 bucket with 30-day rotation and Slack notification on failure". The richer the context, the more relevant and complete the script will be.</p><p>You can adjust the <strong>robustness level</strong> to your needs: a quick script for prototyping will be more concise, while a mission-critical script will include advanced logging, locks to prevent simultaneous execution, and fine-grained signal handling. Feel free to iterate by requesting additions like <strong>external configuration file</strong> support, <strong>systemd</strong> integration, or <strong>automated tests with bats</strong>.</p>
Use Cases
Expected Output
A complete, commented Bash script, ready to use, with shebang, error handling, argument parsing, modular functions, usage examples and improvement recommendations.
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