Optimizing Your Bash Scripts: An Advanced Template and Its Key Features. MIT license.

template.bash

#!/usr/bin/env bash

set -o errexit
set -o nounset
set -o pipefail

if [[ "${DEBUG-0}" == "1" ]]; then
    set -o xtrace
fi

print_help() {
    echo "Usage: $0 input-file output-file

This script transforms the input file and writes the results to the output file.
"
}

if [[ "${1-}" =~ ^-*h(elp)?$ ]]; then
    print_help
    exit
fi

if [[ $# -ne 2 ]]; then
    print_help
    exit 1
fi

cd "$(dirname "$0")"

main() {
    local input_file="$1"
    local output_file="$2"
    echo "Processing ${input_file} and saving results to ${output_file}"
}

main "$@"