Programming in D: The Ultimate Guide for Software Engineers/

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Command-Line Options and the std.getopt Module

In this lesson, you will learn about command-line options and the std.getopt module.

We'll cover the following...

- Command-line options
- std.getopt module

In the previous lesson, you learned all there is to know about the parameters and the return value of main(). However, parsing the arguments is a repetitive task. The std.getopt module is designed to help with parsing the command line options of programs.

Command-line options #

Some parameters like “world” and “hello” are purely data for the program to use. Other kinds of parameters are called command-line options and are used to change the behaviors of programs. An example of a command-line option is the -l option.

Command-line ...

Getting Started With D

Variables and User Input

Arithmetic and Logical Operations on Data Types

Conditional Statements and Loops

Arrays, Characters and Strings

File Handling in D

Literals and enum

Formatted Output and Input

foreach Loop and switch-case Statement

Functions

Immutability

Value Types and Reference Types

Function Parameters

Program Environment

Exceptions and scope

assert and enforce Statements

Unit Testing

Contract Programming

Command-Line Options and the std.getopt Module

Command-line options #