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Bash script template — robust shell scripting boilerplate

Submitted by: @anonymous·Mar 1, 2026·

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bash templatescript boilerplateargument parsinggetoptstrapstrict mode

terminallinuxmacos

Problem

Need a starting template for robust bash scripts with error handling, argument parsing, colored output, cleanup on exit, and help text.

Solution

Production-ready bash script template with strict mode, argument parsing, colored logging, trap cleanup, and usage text.

Code Snippets

Robust bash script template with error handling and arg parsing

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

# Colors
RED='\033[0;31m' GREEN='\033[0;32m' YELLOW='\033[1;33m' NC='\033[0m'
log()  { echo -e "${GREEN}[INFO]${NC} $*"; }
warn() { echo -e "${YELLOW}[WARN]${NC} $*" >&2; }
err()  { echo -e "${RED}[ERROR]${NC} $*" >&2; }
die()  { err "$@"; exit 1; }

# Cleanup on exit
cleanup() { rm -f "$TMPFILE" 2>/dev/null || true; }
trap cleanup EXIT
TMPFILE=$(mktemp)

# Defaults
VERBOSE=false
OUTPUT=""

# Usage
usage() {
  cat <<EOF
Usage: $(basename "$0") [OPTIONS] <input-file>

Options:
  -o FILE   Output file (default: stdout)
  -v        Verbose mode
  -h        Show this help
EOF
  exit 0
}

# Parse args
while getopts ':o:vh' opt; do
  case $opt in
    o) OUTPUT="$OPTARG" ;;
    v) VERBOSE=true ;;
    h) usage ;;
    :) die "Option -$OPTARG requires an argument" ;;
    ?) die "Unknown option -$OPTARG" ;;
  esac
done
shift $((OPTIND - 1))

[[ $# -lt 1 ]] && die "Missing required argument. Use -h for help."
INPUT="$1"
[[ -f "$INPUT" ]] || die "File not found: $INPUT"

log "Processing $INPUT..."
$VERBOSE && log "Verbose mode enabled"

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