Bash Script best practice

#!/usr/bin/env bash
set -o errexit
set -o nounset
set -o pipefail

# Set magic variables for current file & dir
__dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
echo "INFO : __dir is ${__dir}"
__file="${__dir}/$(basename "${BASH_SOURCE[0]}")"
echo "INFO : __file is ${__file}"
__base="$(basename ${__file} .sh)"
echo "INFO : __base is ${__base}"

#__root of the project depends on the location of this script in the folder structure
__root="$(cd "$(dirname "$(dirname "${__dir}")")" && pwd)"
echo "INFO : __root is ${__root}"

for library_module in ${__dir}/library/*; do
   source ${library_module}
done

Explanation

set: set allows you to change the values of shell options and set the positional parameters, or to display the names and values of shell variables.
-o: option-name: Set the option corresponding to option-name:
errexit: Same as -e.
pipefail: If set, the return value of a pipeline is the value of the last (rightmost) command to exit with a non-zero status, or zero if all commands in the pipeline exit successfully. This option is disabled by default.

Reference Click Here

mohanpedala/bash_best_practice.md

Explanation