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84 lines
4.2 KiB
Markdown
84 lines
4.2 KiB
Markdown
[This document is formatted with GitHub-Flavored Markdown. ]:#
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[For better viewing, including hyperlinks, read it online at ]:#
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[https://github.com/kvz/bash3boilerplate/blob/master/FAQ.md ]:#
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## Contents
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* [What is a cli](#what-is-a-cli)?
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* [How do I add a command-line flag](#how-do-i-add-a-command-line-flag)?
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* [How do I access the value of a command-line argument](#how-do-i-access-the-value-of-a-command-line-argument)?
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* [How do I incorporate BASH3 Boilerplate into my own project](#how-do-i-incorporate-bash3boilerplate-into-my-own-project)?
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* [What is a magic variable](#what-is-a-magic-variable)?
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* [How do I incorporate BASH3 Boilerplate into my own project](#how-do-i-incorporate-bash3boilerplate-into-my-own-project)?
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* [How can I contribute to this project](#how-can-i-contribute-to-this-project)?
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<!--more-->
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# Frequently Asked Questions
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## What is a cli?
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A 'cli' is a [command-line interface](https://en.wikipedia.org/wiki/Command-line_interface).
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## How do I incorporate BASH3 Boilerplate into my own project?
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You can incorporate BASH3 Boilerplate into your project one of three ways:
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1. Copy the desired portions of [main.sh](./main.sh) into your own script.
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1. Download [main.sh](./main.sh) and start pressing the delete-key for unwanted things
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Once the `main.sh` has been tailor-made for your project you could either append your own script in the same file, or source it:
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1. Copy [main.sh](./main.sh) into the same directory as your script and then edit and embed it into your script using bash's dot (`.`) include feature, e.g.
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```bash
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#!/usr/bin/env bash
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. main.sh
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```
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1. Source [main.sh](./main.sh) in your script or at the command line
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```bash
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#!/usr/bin/env bash
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. main.sh
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```
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## How do I add a command-line flag?
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1. Copy the line the main.sh [read block](https://github.com/kvz/bash3boilerplate/blob/master/main.sh#L53) that most resembles the desired behavior and paste the line into the same block.
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1. Edit the single-character (e.g., -d) and, if present, the multi-character (e.g., --debug) versions of the flag in the copied line.
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1. Omit the "[arg]" text in the copied line if the desired flag takes no arguments.
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1. Omit or edit the text after "Default:" to set or not set default values, respectively.
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1. Omit the "Required." text if the flag is optional.
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## How do I access the value of a command-line argument?
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To evaluate the value of an argument, append the corresponding single-character flag to the text `$arg_`. For example, if the [read block]
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contains the line
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```bash
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-t --temp [arg] Location of tempfile. Default="/tmp/bar"
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```
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then you can evaluate the corresponding argument and assign it to a variable as follows:
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```bash
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__temp_file_name="${arg_t}"
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```
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## What is a magic variable?
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The [magic variables](https://github.com/kvz/bash3boilerplate/blob/master/main.sh#L63) in `main.sh` are special in that they have a different value, depending on your environment. You can use `${__file}` to get a reference to your current script, `${__dir}` to get a reference to the directory it lives in. This is not to be confused with the location of the calling script that might be sourcing the `${__file}`, which is accessible via `${0}`, and the current directory of the administrator running the script, accessible via `$(pwd)`. Other magic variables are for instance `${__os}` which currently is limited to telling you wether you are on `OSX` and otherwise defaults to `Linux`.
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## How do I submit an issue report?
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Please visit our [Issues](https://github.com/kvz/bash3boilerplate/issues) page.
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## How can I contribute to this project?
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Please fork this repository. Then create a branch containing your suggested changes and submit a pull request based on the master branch
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of <https://github.com/kvz/bash3boilerplate/>. We're a welcoming bunch, happy to accept your contributions!
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## Why are you typing BASH in all caps?
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As an acronym, Bash stands for Bourne-again shell, and is usually written with one uppercase.
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This project's name however is "BASH3 Boilerplate" as a reference to
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"[HTML5 Boilerplate](https://html5boilerplate.com/)", which was founded to serve a similar purpose,
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only for crafting webpages.
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Somewhat inconsistent but true to Unix ancestry, the abbreviation for our project is "b3bp".
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