By W. Richard Stevens
For greater than 20 years, critical C programmers have depended on one ebook for sensible, in-depth wisdom of the programming interfaces that force the UNIX and Linux kernels: W. Richard Stevens’ complicated Programming within the UNIX® setting . Now, once more, Rich’s colleague Steve Rago has completely up to date this vintage paintings. the recent 3rd variation helps today’s major systems, displays new technical advances and top practices, and aligns with model four of the only UNIX Specification.
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Extra info for Advanced Programming in the UNIX(R) Environment
In fact, many Unix novices successfully install Linux on their systems. This is a worthwhile learning experience, but keep in mind that it can be very frustrating to some. If you’re lucky, you will be able to install and start using your Linux system without any Unix background. However, once you are ready to delve into the more complex tasks of running Linux—installing new software, recompiling the kernel, and so forth—having background knowledge in Unix is going to be a necessity. ) Fortunately, by running your own Linux system, you will be able to learn the essentials of Unix necessary to perform these tasks.
The core dump, which appears as a file called core in the directory that the program was running, allows the programmer to determine the cause of the crash. We talk about the use of core dumps for debugging in the section “Examining a Core File” in Chapter 21. Commands and Shells The most important utility to many users is the shell. The shell is a program that reads and executes commands from the user. In addition, many shells provide features such as job control (allowing the user to manage several running processes at once—not as Orwellian as it sounds), input and output redirection, and a command language for writing shell scripts.
However, any derived works from GPL software must also be covered by the GPL. In other words, a company could not take Linux, modify it, and sell it under a restrictive license. If any software is derived from Linux, that software must be covered by the GPL as well. People and organizations can distribute GPL software for a fee and can even make a profit from its sale and distribution. However, in selling GPL software, the distributor can’t take those rights away from the purchaser; that is, if you purchase GPL software from some source, you may distribute the software for free or sell it yourself as well.