By Daniel J. Barrett
O'Reilly's Pocket publications have earned a name as low-cost, accomplished, and compact publications that experience the stuff yet now not the fluff. each web page of Linux Pocket consultant lives as much as this billing. It sincerely explains find out how to wake up to hurry quick on day by day Linux use. as soon as you're up and operating, Linux Pocket consultant presents an easy-to-use reference for you to retain by means of your keyboard for these occasions should you desire a speedy, invaluable solution, now not hours within the guy pages.
Linux Pocket advisor is prepared how you use Linux: via functionality, not only alphabetically. It's no longer the 'bible of Linux; it's a realistic and concise consultant to the choices and instructions you would like such a lot. It begins with normal suggestions like documents and directories, the shell, and X home windows, after which offers specific overviews of the main crucial instructions, with transparent examples. You'll research each one command's function, utilization, ideas, situation on disk, or even the RPM package deal that put in it.
The Linux Pocket advisor is adapted to Fedora Linux--the most up-to-date spin-off of purple Hat Linux--but lots of the info applies to any Linux system.
Throw in a bunch of necessary energy consumer counsel and a pleasant and available type, and you'll fast locate this functional, to-the-point e-book a small yet strong source for Linux users.
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Up-to-date for the most recent LPIC-1 tests one hundred and one and 102
The LPIC-1 certification measures your figuring out of the Linux Kernel. because the Linux server marketplace keeps to develop, so does the call for for qualified Linux directors. arrange for the newest models of the LPIC-1 tests a hundred and one and 102 with the recent variation of this distinct research consultant. This useful publication covers key Linux management issues and all examination pursuits and comprises real-world examples and assessment inquiries to assist you perform your talents. moreover, you'll achieve entry to a whole set of on-line learn instruments, together with bonus perform checks, digital flashcards, and more.
• Prepares applicants to take the Linux specialist Institute tests a hundred and one and 102 and attain their LPIC-1 certification
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• contains real-world eventualities, and hard evaluate questions
• subject matters contain approach structure, install, GNU and Unix instructions, Linux filesystems, crucial approach prone, networking basics, protection, and more
Approach the LPIC-1 certification tests with self belief, with LPIC-1: Linux specialist Institute Certification examine consultant, 3rd version.
As Linux raises its presence through the international as a objective platform for pro program improvement, its development as a strong, versatile method supplying many unfastened improvement instruments assures its position sooner or later. by means of providing you with quick access to this finished diversity of instruments, aiding new and nascent applied sciences, at very little fee, constructing with Linux enables you to follow the answer that is good for you.
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Extra info for Linux Pocket Guide
H. h files mentioned earlier. 16 | Chapter 1: Introduction This is the Title of the Book, eMatter Edition Copyright © 2008 O’Reilly & Associates, Inc. All rights reserved. Catching Bugs A few functions are supposed to be called under specific conditions, or are not supposed to be called under certain conditions. The kernel uses the BUG_ON and BUG_TRAP macros to catch cases where such conditions are not met. When the input condition to BUG_TRAP is false, the kernel prints a warning message. BUG_ON instead prints an error message and panics.
Iph->tos; TCP_SKB_CB(skb)->sacked = 0; ... ... c. That function is used by TCP to push a data segment down to the IP layer for transmission. In Chapter 22, you will also see how IPv4 uses cb to store information about IP fragmentation. unsigned int csum unsigned char ip_summed These represent the checksum and associated status flag. Their use is described in Chapter 19. unsigned char cloned A boolean flag that, when set, indicates that this structure is a clone of another sk_buff buffer. ” unsigned char pkt_type This field classifies the type of frame based on its L2 destination address.
This leads to gradual memory exhaustion. • If you take a reference to a data structure but forget to call xxx_hold, and at some later point you happen to be the only reference holder, the structure will be prematurely freed because you are not accounted for. This case definitely can be more catastrophic than the previous one; your next attempt to access the structure can corrupt other data or cause a kernel panic that brings down the whole system instantly. When a data structure is to be removed for some reason, the reference holders can be explicitly notified about its going away so that they can politely release their references.