Bash strict mode starter template using set -Eeuo pipefail, with safe defaults, error handling, and argument parsing.

bash-strict-mode.sh

#!/usr/bin/env bash
# -----------------------------------------------------------------------------
# Bash Strict Mode Starter Template
# -----------------------------------------------------------------------------
# -e  : Exit immediately if a command exits with a non-zero status
# -u  : Treat unset variables as an error
# -o pipefail : Fail a pipeline if any command fails
# -E  : ERR traps are inherited by shell functions
# -----------------------------------------------------------------------------

set -Eeuo pipefail

# -----------------------------------------------------------------------------
# Globals
# -----------------------------------------------------------------------------
SCRIPT_NAME="$(basename "$0")"

# -----------------------------------------------------------------------------
# Logging helpers
# -----------------------------------------------------------------------------
log() {
  printf '[%s] %s\n' "$SCRIPT_NAME" "$*"
}

error() {
  printf '[%s] ERROR: %s\n' "$SCRIPT_NAME" "$*" >&2
}

# -----------------------------------------------------------------------------
# Error handler
# -----------------------------------------------------------------------------
trap 'error "Command failed at line $LINENO"; exit 1' ERR

# -----------------------------------------------------------------------------
# Usage
# -----------------------------------------------------------------------------
usage() {
  cat <<EOF
Usage: $SCRIPT_NAME [options]

Options:
  -h, --help    Show this help message

EOF
}

# -----------------------------------------------------------------------------
# Argument parsing
# -----------------------------------------------------------------------------
while [[ $# -gt 0 ]]; do
  case "$1" in
    -h|--help)
      usage
      exit 0
      ;;
    *)
      error "Unknown option: $1"
      usage
      exit 1
      ;;
  esac
done

# -----------------------------------------------------------------------------
# Main logic
# -----------------------------------------------------------------------------
main() {
  log "Script started"

  # Example command
  # ls /nonexistent   # Uncomment to see strict mode in action

  log "Script finished successfully"
}

main "$@"