Building Embedded Linux Systems (2nd Edition) by Karim Yaghmour

By Karim Yaghmour

Karim Yaghmour, Jon Masters, "Building Embedded Linux structures, 2d Edition"
2008 | ISBN: 0596529686 | writer: O’Reilly Media | MOBI | 462 pages | five + four MB

There's loads of pleasure surrounding using Linux in embedded structures -- for every thing from mobile phones to vehicle ABS platforms and water-filtration crops -- yet no longer loads of sensible info. construction Embedded Linux platforms deals an in-depth, hard-core consultant to assembling embedded platforms according to Linux.

Updated for the most recent model of the Linux kernel, this re-creation delivers the fundamentals of creating embedded Linux structures, in addition to the configuration, setup, and use of greater than forty assorted open resource and loose software program applications in universal use. The ebook additionally seems to be on the strengths and weaknesses of utilizing Linux in an embedded method, plus a dialogue of licensing concerns, and an advent to real-time, with a dialogue of real-time strategies for Linux.

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The Linux shell provides you with many programming tools with which to create shell programs. You can define variables and assign values to them. You can also define variables in a script file and have a user interactively enter values for them when the script is executed. There are loop and conditional control structures that repeat Linux commands or make decisions on which commands you want to execute. You can also construct expressions that perform arithmetic or comparison operations. All these programming tools operate like those found in other programming languages.

The output of the sort command is piped to the cat command with the -n option to number lines, and then the result is saved in the nfile file. $ sort mylist | cat -n > nfile What if you need to save the result in nfile and print it out? You cannot do something like this: $ sort mylist | cat -n > nfile | lpr ERROR The only way to save the output in a file and print it is to use the tee command: $ sort mylist | cat -n | tee nfile | lpr Page 21 You can use tee anywhere in the piping sequence. The next example saves a sorted version of the list while printing the numbered version.

You cannot do something like this: $ sort mylist | cat -n > nfile | lpr ERROR The only way to save the output in a file and print it is to use the tee command: $ sort mylist | cat -n | tee nfile | lpr Page 21 You can use tee anywhere in the piping sequence. The next example saves a sorted version of the list while printing the numbered version. $ sort mylist | tee sfile | cat -n | lpr Redirecting and Piping the Standard Error: >&, 2>, |& When you execute commands, it is possible that an error could occur.

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