By Stephen G. Kochan, Patrick Wood
Shell Programming in Unix, Linux and OS X is a completely up-to-date revision of Kochan and Wood’s vintage Unix Shell Programming tutorial. Following the method of the unique textual content, the ebook makes a speciality of the POSIX regular shell, and teaches you the way to strengthen courses during this helpful programming setting, taking complete benefit of the underlying energy of Unix and Unix-like working systems.
After a short evaluation of Unix utilities, the book’s authors take you step by step throughout the strategy of construction shell scripts, debugging them, and knowing how they paintings in the shell’s setting. All significant positive factors of the shell are coated, and the big variety of sensible examples make it effortless so you might construct shell scripts on your specific purposes. The booklet additionally describes the most important positive factors of the Korn and Bash shells.
Learn how to…
Take benefit of the various utilities supplied within the Unix system
Write robust shell scripts
Use the shell’s integrated decision-making and looping constructs
Use the shell’s strong quoting mechanisms
Make the main of the shell’s integrated historical past and command modifying capabilities
Use ordinary expressions with Unix commands
Take good thing about the specific good points of the Korn and Bash shells
Identify the main transformations among models of the shell language
Customize the best way your Unix process responds to you
Set up your shell environment
Make use of functions
Contents at a Glance
1 A fast evaluation of the Basics
2 What Is the Shell?
3 Tools of the Trade
4 And Away We Go
5 Can I Quote You on That?
6 Passing Arguments
7 Decisions, Decisions
8 ‘Round and ‘Round She Goes
9 Reading and Printing Data
10 Your Environment
11 extra on Parameters
12 free Ends
13 Rolo Revisited
14 Interactive and Nonstandard Shell Features
A Shell Summary
B For extra Information
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Extra resources for Shell Programming in Unix, Linux and OS X
As with standard output, this is your terminal (or keyboard) by default. When input is entered this way, an end-of-file sequence must be specified after the last line is typed, and, by Unix convention, that舗s Ctrl+d; that is, the sequence produced by simultaneously pressing the Control (or Ctrl, depending on your keyboard) key and the d key. As an example, let舗s use the sort command to sort the following four names: Tony, Barbara, Harry, Dirk. Instead of first entering the names into a file, we舗ll enter them directly from the terminal: $ sort Tony Barbara Harry Dirk Ctrl+d Barbara Dirk Harry Tony $ Because no filename was specified to the sort command, the input was taken from standard input, the terminal.
For example, [a舑np舑z]* matches all files that start with the letters a through n or p through z (or more simply stated, any filename that doesn舗t start with the lowercase letter o). , the sense of the match is inverted. That is, any character is matched except those enclosed in the brackets. o] matches any file that doesn舗t end with the lowercase letter o. 1 gives a few more examples of filename substitution. 1 Filename Substitution Examples Filename Nuances Spaces in Filenames A discussion of command lines and filenames wouldn舗t be complete without talking about the bane of old-school Unix people and very much the day-to-day reality of Linux, Windows, and Mac users: spaces in filenames.
We turn to the shell as our first choice of programming language and after you become adept at shell programming, you will too. How This Book Is Organized This book assumes that you are familiar with the fundamentals of the system and command line; that is, that you know how to log in; how to create files, edit them, and remove them; and how to work with directories. 舡 In addition, filename substitution, I/O redirection, and pipes are also reviewed in the first chapter. ,舡 reveals what the shell really is, how it works, and how it ends up being your primary method of interacting with the operating system itself.