bash-template.sh

#!/usr/bin/env bash

# When a command fails, bash exits instead of continuing with the rest of the script.
set -o errexit

# This will make the script fail, when accessing an unset variable.
# When you want to access a variable that may or may not have been set,
#   use "${VARNAME-}" instead of "$VARNAME", and you’re good.
set -o nounset


# This will ensure that a pipeline command is treated as failed,
#   even if one command in the pipeline fails.
set -o pipefail

# This helps in debugging your scripts, a lot. Like, really lot.
# People can now enable debug mode, by running your script
#   as TRACE=1 ./script.sh instead of ./script.sh.
# Also, use [[ ]] for conditions in if/else statements.
if [[ "${TRACE-0}" == "1" ]]; then
    set -o xtrace
fi

if [[ "${1-}" =~ ^-*h(elp)?$ ]]; then
    echo 'Usage: ./script.sh arg-one arg-two

This is an awesome bash script to make your life better.

'
    exit
fi

# If appropriate, change to the script’s directory close to the start of the script
cd "$(dirname "$0")"

main() {
    echo "Hello, World!"
}

main "$@"