What does the Bash Script Generator produce?

A hardened, shellcheck-clean Bash skeleton assembled from your choices: shebang (#!/usr/bin/env bash or #!/bin/bash), strict mode (set -euo pipefail, IFS=$'\n\t'), an auto-generated usage() and --help from your declared flags, a getopts/long-option argument parser, EXIT/ERR/INT traps with mktemp -d cleanup, logging helpers (info/warn/error to stderr with optional colors and --verbose/--quiet), a dependency-check block, dry-run scaffolding, optional root-required check, optional OS detection, and positional argument validation.

How do I declare flags and positional arguments?

Add a flag row with a short letter (e.g. f), a long name (e.g. --file), a description, whether it takes a value, whether it's required, and an optional default. Add a positional with a name, description, and required toggle. The generator emits a parser that handles short/long flags (with `--flag=value` and `--flag value` forms), validates required flags, applies defaults, validates required positionals, and prints usage on error or --help.

Are the generated traps and cleanup safe?

Yes. When traps are enabled the script creates a temp dir with `TMP_DIR="$(mktemp -d)"` and registers a cleanup function on EXIT, INT, and ERR that `rm -rf "$TMP_DIR"`. The ERR trap prints the failing line number and exit code. On ERR the script exits non-zero so `set -e` semantics are preserved. Inline comments explain each section.

Will the output pass ShellCheck?

Yes — the generator targets ShellCheck-clean output. Every variable expansion is double-quoted, `$(...)` is used instead of backticks, `[` is replaced with `[[`, `echo -e` is avoided in favor of `printf`, and `function` keyword is omitted. There are a few intentional SC2086-free patterns (e.g. inside `(( ))`); each is documented with a comment.

What extra features does this tool have versus copy-paste gists?

(1) Shebang + strict-mode toggles. (2) Flag declaration table → generated parser with --help. (3) Positional argument declarations with required validation. (4) EXIT/ERR/INT traps with mktemp -d cleanup. (5) Logging helpers (info/warn/error to stderr, optional colors, --verbose/--quiet). (6) Dependency-check block (command -v guards). (7) Dry-run scaffolding (--dry-run flag wired in). (8) Root-required check. (9) OS detection. (10) Five presets: file-ops, system-info, backup, deployment, monitoring. (11) Live preview as you edit. (12) Copy / download .sh. (13) Shareable URL preset. (14) Inline explanatory comments. (15) Configurable script name + description. 100% client-side — your config never leaves the browser.

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Bash Script Generator / Boilerplate

Generate a hardened, shellcheck-clean Bash script skeleton from a few choices: shebang, strict mode (set -euo pipefail), getopts/long-option flag parser with auto-generated usage() and --help, EXIT/ERR/INT traps with temp-dir cleanup, logging helpers (info/warn/error to stderr with optional colors), dependency-check, dry-run scaffolding, root-required check, OS detection, and positional argument validation. Five presets: file ops, system info, backup, deployment, monitoring. Copy/download .sh, shareable URL. 100% client-side.

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Script settings

Script name

Version

Shebang

Description (shown in --help)

Toggles

Dependency check (comma-separated commands)

Presets

Flags (0)

No flags declared. The parser will still handle --help and toggles.

Positional arguments (0)

No positional arguments declared.

Generated script153 lines valid

Flags

Positionals

Dependencies

Toggles on

#
# my-script — A short description of what this script does.
# Version: 1.0.0
#
# Usage:
#   See --help.
#
# Generated by UnQTools Bash Script Generator. 100% client-side.

#!/usr/bin/env bash

# ---------------------------------------------------------------------------
# Strict mode: fail on error, undefined var, pipe failure. Safe IFS.
# ---------------------------------------------------------------------------
set -euo pipefail
IFS=$'\n\t'

# ---------------------------------------------------------------------------
# Constants
# ---------------------------------------------------------------------------
readonly SCRIPT_NAME="my-script"
readonly SCRIPT_VERSION="1.0.0"
readonly SCRIPT_DESC="A short description of what this script does."

# ---------------------------------------------------------------------------
# ANSI colors (only when stderr is a TTY).
# ---------------------------------------------------------------------------
if [[ -t 2 ]]; then
  readonly CLR_RED=$'\e[31m'
  readonly CLR_YEL=$'\e[33m'
  readonly CLR_GRN=$'\e[32m'
  readonly CLR_BLU=$'\e[34m'
  readonly CLR_RST=$'\e[0m'
else
  readonly CLR_RED=''
  readonly CLR_YEL=''
  readonly CLR_GRN=''
  readonly CLR_BLU=''
  readonly CLR_RST=''
fi

# ---------------------------------------------------------------------------
# Logging helpers. All output goes to stderr so stdout stays clean.
# Honors --quiet (suppress INFO) and --verbose (show DEBUG).
# ---------------------------------------------------------------------------
log_info() {
  if [[ "${QUIET:-0}" != "1" ]]; then
    printf '%s %s\n' "${CLR_BLU}[INFO]${CLR_RST}" "$*" >&2
  fi
}
log_warn() {
  printf '%s %s\n' "${CLR_YEL}[WARN]${CLR_RST}" "$*" >&2
}
log_error() {
  printf '%s %s\n' "${CLR_RED}[ERROR]${CLR_RST}" "$*" >&2
}
log_ok() {
  if [[ "${QUIET:-0}" != "1" ]]; then
    printf '%s %s\n' "${CLR_GRN}[OK]${CLR_RST}" "$*" >&2
  fi
}
log_debug() {
  if [[ "${VERBOSE:-0}" == "1" ]]; then
    printf '[DEBUG] %s\n' "$*" >&2
  fi
}
die() {
  log_error "$*"
  exit 1
}

# ---------------------------------------------------------------------------
# usage() — print help. Auto-generated from declared flags.
# ---------------------------------------------------------------------------
usage() {
  printf 'Usage: %s [OPTIONS]' "${SCRIPT_NAME}"
  printf '\n'
  printf '\n%s\n' "${SCRIPT_DESC}"
  printf '\nOptions:\n'
  printf '  -h, --help              Show this help and exit\n'
  printf '  -v, --verbose           Verbose output (DEBUG logs)\n'
  printf '  -q, --quiet             Suppress INFO logs\n'
  printf '\nVersion: %s\n' "${SCRIPT_VERSION}"
}

# ---------------------------------------------------------------------------
# Temp dir + cleanup. Traps ensure TMP_DIR is removed on EXIT/INT/ERR.
# ---------------------------------------------------------------------------
TMP_DIR=""
cleanup() {
  local code=$?
  if [[ -n "$TMP_DIR" && -d "$TMP_DIR" ]]; then
    rm -rf "$TMP_DIR"
  fi
  exit "$code"
}
on_err() {
  local code=$?
  local line=${1:-}
  log_error "Failure on line ${line} (exit ${code})"
  cleanup "$code"
}
TMP_DIR="$(mktemp -d 2>/dev/null || mktemp -d -t tmp)"
trap 'cleanup' EXIT
trap 'cleanup' INT
trap 'on_err ${LINENO}' ERR

# ---------------------------------------------------------------------------
# Default flag values.
# ---------------------------------------------------------------------------
VERBOSE=0
QUIET=0

# ---------------------------------------------------------------------------
# Argument parser. Manual while/case loop supports -s, --long, --long=value,
# and -sVALUE forms. Remaining args are positionals.
# ---------------------------------------------------------------------------
POSITIONAL=()
while [[ $# -gt 0 ]]; do
  case "$1" in
    -h|--help)
      usage; exit 0 ;;
    -v|--verbose)
      VERBOSE=1; shift ;;
    -q|--quiet)
      QUIET=1; shift ;;
    --)
      shift; break ;;
    -*)
      die "Unknown option: $1" ;;
    *)
      POSITIONAL+=("$1"); shift ;;
  esac
done

# No required flags to validate.

# No declared positional arguments.
set -- "${POSITIONAL[@]}"

# ---------------------------------------------------------------------------
# Main
# ---------------------------------------------------------------------------
main() {
  log_info "Starting ${SCRIPT_NAME}"
  # TODO: implement the script logic here.
  # Use "$TMP_DIR" for scratch files (auto-cleaned on exit).
  log_ok "Done."
}

main "$@"

exit 0

Privacy: All script generation runs locally. Your config never leaves the browser. History is stored in localStorage on this device only.

How to use

Enter your input in the tool above.
Adjust any options to your preference.
Use the Copy or Download buttons to save the result.
Everything happens locally — your data never leaves your browser.

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