Bash Script Skeleton Generator

A Bash script skeleton is a pre-built template that includes essential boilerplate code — shebang, error handling, logging, argument parsing, and cleanup routines. It saves developers time by providing a solid, production-ready foundation so they can focus on the script's unique logic rather than repetitive setup.

set -euo pipefail is considered the "strict mode" for Bash. set -e exits on any command failure, set -u treats unset variables as errors, and set -o pipefail ensures a pipeline fails if any command in it fails. Together they catch bugs early and prevent scripts from continuing in an unexpected state.

Colors in Bash are added using ANSI escape codes. For example, \033[0;31m sets red text and \033[0m resets it. Common codes include: Red (31), Green (32), Yellow (33), Blue (34), and Bold (1). Our generator creates reusable color variables like RED, GREEN, NC (No Color) so you can use them throughout your script.

#!/bin/bash uses an absolute path and fails if Bash is installed elsewhere. #!/usr/bin/env bash searches the user's PATH for Bash, making it more portable across systems (e.g., macOS with Homebrew-installed Bash). The env approach is generally recommended for cross-platform scripts.

The trap command catches signals like EXIT, INT (Ctrl+C), and TERM, running a cleanup function before the script terminates. This is essential for removing temporary files, releasing locks, or restoring system state — even if the script fails unexpectedly. It's a hallmark of robust, production-grade scripts.

The most common method is using getopts (for short flags like -h, -v) or a manual while loop with case statements for both short and long options (--help, --version). Our generator creates a clean argument parser supporting -h/--help, -v/--verbose, -c/--config, and more.

A lock file prevents multiple instances of the same script from running concurrently, which is critical for cron jobs, backup scripts, or database operations. The script checks for an existing lock file at startup; if found, it exits gracefully. The lock is automatically removed on exit via trap.

Production scripts typically include: INFO (general progress), WARN (non-critical issues), ERROR (failures that may not stop execution), DEBUG (detailed troubleshooting info, often hidden behind a --verbose flag), and SUCCESS (confirmation messages). Each level can use a different color for quick visual scanning.

#!/bin/sh targets POSIX-compliant shells and runs on virtually any Unix-like system. However, it lacks Bash-specific features like arrays, [[ test syntax, shopt, and associative arrays. Use /bin/sh for simple, portable scripts; use /bin/bash when you need its richer feature set.

A well-documented script header should include: script name, brief description, author, version, date, license, and usage examples. This metadata helps other developers (and your future self) understand the script's purpose and how to run it without reading the entire codebase. Our generator auto-fills this section.