December 2008
Intermediate to advanced
320 pages
6h 45m
English
Content preview from Expert Shell Scripting
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CHAPTER 7Indirect Reference Variables
It is possible to set a normal (direct) variable in three ways:
- Directly, by assigning it a value
- By storing the output of a command
- By storing the results of some type of calculation
In all of these cases, although you might not know a variable's value in advance of any given point, you do know the name of the variable that is to receive the value.
For example, AGE=36 is a direct variable assignment. The value of 36 might change at a later stage and it may also have some calculation applied to it, but the variable name AGE will not change.
In some cases, however, you may need the ability to generate variable names on the fly. You may not know the number or names of variables you are going to need at the ...
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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.