November 2008
Beginner
372 pages
11h 33m
English
Content preview from Beginning Portable Shell Scripting: From Novice to Professional
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CHAPTER 1Introduction to Shell Scripting
The UNIX command-line interface has been criticized for complexity and a steep learning curve, but no one disputes that it is one of the most flexible and programmable user interfaces ever developed. The core of the UNIX command-line interface is the shell, a program that interprets and executes user commands. The shell can take commands from a keyboard or stored in files; the syntax and commands are the same either way. A file containing shell commands is called a shell script. Many systems offer shells that are arguably programmable; the UNIX shell environment is actually good at it. As a result, thousands upon thousands of programs have been implemented as shell scripts. This book treats the shell ...
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