Pro Bash Programming : Scripting the Linux Shell PDF
by Chris Johnson
Description
Introduction Although most users think of the shell as an interactive command interpreter, it is really a programming language in which each statement runs a command. Because it must satisfy both the interactive and programming aspects of command execution, it is a strange language, shaped as much by history as by design.
Brian Kernighan and Rob Pike, The UNIX Programming Environment, Prentice-Hall, 1984 The shell is a programming language.
Don't let anyone tell you otherwise. The shell is not just glue that sticks bits together.
The shell is a lot more than a tool that runs other tools.
The shell is a complete programming language! When a Linux user asked me about membership databases, I asked him what he really needed.
He wanted to store names and addresses for a couple of hundred members and print mailing labels for each of them.
I recommended using a text editor to store the information in a text file, and I provided a shell script to create the labels in PostScript. (The script, ps-labels, appeared in my first book, Shell Scripting Recipes: A Problem-Solution Approach. ) When the SWEN worm was dumping hundreds of megabytes of junk into my mailbox every few minutes, I wrote a shell script to filter them out on the mail server and download the remaining mail to my home computer.
That script has been doing its job for several years.
Information
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Download - Immediately Available
- Format:PDF
- Publisher:Apress
- Publication Date:05/12/2009
- Category:
- ISBN:9781430219989
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Information
-
Download - Immediately Available
- Format:PDF
- Publisher:Apress
- Publication Date:05/12/2009
- Category:
- ISBN:9781430219989
