Rust 在这个领域要大放异彩：一本新书推荐（附下载）
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https://www.oreilly.com/library/view/command-line-rust/9781098109424/
Getting Started with “Hello, world!” Organizing a Rust Project Directory Creating and Running a Project with Cargo Writing and Running Integration Tests Adding a Project Dependency Understanding Program Exit Values Testing the Program Output Exit Values Make Programs Composable Summary
How echo Works Getting Started Accessing the Command-Line Arguments Adding clap as a Dependency Parsing Command-Line Arguments Using clap Creating the Program Output Writing Integration Tests Creating the Test Output Files Comparing Program Output Using the Result Type Summary
How cat Works Getting Started Starting with Tests Creating a Library Crate Defining the Parameters Iterating Through the File Arguments Opening a File or STDIN Using the Test Suite Solution Reading the Lines in a File Printing Line Numbers Going Further Summary
How head Works Getting Started Writing a Unit Test to Parse a String into a Number Converting Strings into Errors Defining the Arguments Processing the Input Files Reading Bytes Versus Characters Solution Reading a File Line by Line Preserving Line Endings While Reading a File Reading Bytes from a File Printing the File Separators Going Further Summary
How wc Works Getting Started Iterating the Files Writing and Testing a Function to Count File Elements Solution Counting the Elements of a File or STDIN Formatting the Output Going Further Summary
How uniq Works Getting Started Defining the Arguments Testing the Program Processing the Input Files Solution Going Further Summary
How find Works Getting Started Defining the Arguments Validating the Arguments Finding All the Things Solution Conditionally Testing on Unix Versus Windows Going Further Summary
How cut Works Getting Started Defining the Arguments Parsing the Position List Extracting Characters or Bytes Parsing Delimited Text Files Solution Selecting Characters from a String Selecting Bytes from a String Selecting Fields from a csv::StringRecord Final Boss Going Further Summary
How grep Works Getting Started Defining the Arguments Finding the Files to Search Finding the Matching Lines of Input Solution Going Further Summary
How comm Works Getting Started Defining the Arguments Validating and Opening the Input Files Processing the Files Solution Going Further Summary
How tail Works Getting Started Defining the Arguments Parsing Positive and Negative Numeric Arguments Using a Regular Expression to Match an Integer with an Optional Sign Parsing and Validating the Command-Line Arguments Processing the Files Counting the Total Lines and Bytes in a File Finding the Starting Line to Print Finding the Starting Byte to Print Testing the Program with Large Input Files Solution Counting All the Lines and Bytes in a File Finding the Start Index Printing the Lines Printing the Bytes Benchmarking the Solution Going Further Summary
How fortune Works Getting Started Defining the Arguments Finding the Input Sources Reading the Fortune Files Randomly Selecting a Fortune Printing Records Matching a Pattern Solution Going Further Summary
How cal Works Getting Started Defining and Validating the Arguments Writing the Program Solution Going Further Summary
How ls Works Getting Started Defining the Arguments Finding the Files Formatting the Long Listing Displaying Octal Permissions Testing the Long Format Solution Notes from the Testing Underground Going Further Summary
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