Quit programs that refuse to quit normally. See which programs are running and what system resources they’re consuming. Make shell scripts that have variables, user input, conditional statements, loops, and math. Create basic shell scripts to automate repetitive tasks. You’ll extend your skills as you discover how to: How to get help (Joe goes way beyond telling you to read the man pages). The importance of your PATH and how to change it, if you need to. How to customize your prompt and other shell defaults. How to start and stop a command-line program. Basic file management: creating, copying, moving, renaming, opening, viewing, and deleting files. How to navigate your Mac’s directory structure. Next, it’s on to the command line, where you’ll learn: 
The basics of Terminal’s interface and how to customize it. Exactly how commands, arguments, and flags work. The differences among Unix, a command line, a shell, and Terminal. The book begins by teaching you these core concepts: Mona Hosseini, grad student in Genomic Medicine and Statistics at the University of Oxford Thank you for the time and art that you spent to create such a clarifying text. I am definitely more confident now in facing the Mac command line. 
I found answers to many questions in your book, and I enjoyed reading it.
Joe includes 66 real-life “recipes” for tasks that are best done from the command line, as well as directions for working with permissions, carrying out grep-based searches, creating shell scripts, and installing Unix software. If you’ve ever thought you should learn to use the Unix command line that underlies macOS, or felt at sea when typing commands into Terminal, Joe Kissell is here to help! With this 226-page book, you’ll become comfortable working on the Mac’s command line, starting with the fundamentals and adding more advanced topics as your knowledge increases.
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