October 2000
Intermediate to advanced
1152 pages
26h 41m
English
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Variables
Linux shell programming is a full-fledged programming language and, as such, supports various types of variables. Variables have three major types: environment, built-in, and user.
Environment variables are part of the system environment, and you do not have to define them. You can use them in your shell program. Some of them, such as PATH, can also be modified within a shell program.
Built-in variables are provided by the system. Unlike environment variables, you cannot modify them.
User variables are defined by you when you write a shell script. You can use and modify them at will within the shell program.
A major difference between shell programming and other programming languages is that in shell programming, variables are not typecast. ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.