December 2008
Intermediate to advanced
320 pages
6h 45m
English
Content preview from Expert Shell Scripting
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CHAPTER 18User Input Timeout
Sometimes you want a program that accepts user input to run automatically. If the user does not type anything within a specified amount of time, the program should continue running and use a default value for input.
A boot loader is a good example of this type of application. It would give the user a prompt where they will be able to choose the OS or kernel to be booted, but if the user lets the timeout expire, the boot loader uses a previously defined default operating system to boot the system.
An automated system-build script is another example. I wrote one to perform an automated system build while running from a bootable CD. This script would allow the user to choose how to build the system. If there were no ...
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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.