Shortcuts for ip made easy

Hedging our bets is what this issue of Troubleshooting Professional Magazine is all about. In this case the semaphore clean up code simply discards the sem_undo data structure. Commands run as a result of command substitu- tion ignore the keyboard-generated job control signals SIGTTIN, SIGTTOU, and SIGTSTP. All system times …

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No more mistakes with pushd

When I have unmounted the VFAT partition the system detects that I no longer need the VFAT file system module and removes it from the system. If you can use a computer or other electronic device, you can use Linux. The fact that open source code offers complete transparency acts …

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Redirecting standard output on the PocketLinux operating system

Linux provides any tools you need as a developer to operate a scalable, secure servers. When Corporations are happy with the used software they donate money to the communities in order to be able to continue their work and developing new versions. Instead, it focuses on user-space system-level programming, that …

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The importance of psacct on the Rasberry Pi

When you boot a system that uses the GRUB Legacy bootloader, you'll see a menu that shows the boot options that you defined in the configuration file. In a very real sense Linux is a product of the Internet or World Wide Web (WWW). Device drivers have to be careful …

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Linux adventures with bzless

As Fedora is backed by Red Hat, you can expect it to work without issues while development process. Quite the contrary, the artisans and artists who craft software which can be shared, improved, and shared again are building an infrastructure at least as beneficial to society and the economy of …

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Compiling your own kernel on Asianux

Share your personal experiences (good and bad) with Linux. They represent a totally different way of producing software that opens up every aspect of development, debugging, testing, and study to anyone with enough interest in doing so. Purchasing your own digital signature key can be expensive, and somewhat cumbersome if …

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Minimize speed when using your first file modifier

When I have unmounted the VFAT partition the system detects that I no longer need the VFAT file system module and removes it from the system. If no output_file is supplied, output goes to stdout. The INET socket layer supports the internet address family which contains the TCP/IP protocols …

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Getting the best out of install when using Ubuntu

The installation and setup process of this Linux distro for programmers is almost just like Fedora. For some small business leaders I've consulted, the human factor is either a notion to be rejected or ignored. Perhaps it will become easier to provide a better answer to the debate among free …

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Create your own video streaming server with VectorLinux

Getting involved with kernel development is, paradoxically, both easier than it seems like it should be, and also ridiculously difficult. These unique addresses are built into each ethernet device when they are manufactured and it is usually kept in an SROM2 on the ethernet card. Different distributions have chosen varying …

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Interesting apps based on ranlib

Users of closed source operating systems must report the bug to the manufacturer and wait for the manufacturer to develop, test, and release a solution to the problem, known as a hot fix. A regular file contains bytes of data, organized into a linear array called a byte stream. As …

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Open the gates for rlogin

These extensions are collectively called GNU C, and are documented in Appendix A. It is also an excellent platform for working systems, both open and closed, because it is so heavily customizable for free. The controllers are processors like the CPU itself, they can be viewed as intelligent helpers to …

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How to evaluate error messages with objcopy

Even your car has Linux running under the hood. For small contributions and bug fixes, it is unlikely that there will be any long-term maintenance expected. For example, when we add a user named "paul," Linux creates a directory /home/paul. The first, the old timer mechanism, has a static …

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No more mistakes with touch

The thorough and col- laborative open source approach to testing software and fixing software bugs increases the stability of Linux; it is not uncommon to find a Linux system that has been running contin- uously for months or even years without being turned off.Security, a vital concern for most …

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Instance names should not be specified when using at

Indeed, in the case of Linux-based cash registers, it would in all likelihood be a security risk to release the code to a wide audience. he Linux terminal is superior to use over Window's command line for developers. The API user (generally, the higher-level software) has zero input into the …

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Programming with Python on Ubuntu Kylin

The world economy will not collapse if creators of software choose to share their work with the world. Running a UNIX system is not an easy task, not even for commercial versions of UNIX. Open source software isn't free from cost, of course. Make use of this command often so …

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Understanding the fundamentals of gawk

Its vast package database and supportive community is another plus point. This means that if a system has two IDE controllers there will be entries for the IDE subsystem at indices at 3 and 22 in the blk_dev and blkdevs vectors. Most of the time you will be issuing commands …

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How logname can help power your webapp

Slackware includes LILO and Loadlin for booting Slackware Linux. Instead, Linux aims toward compliance with two of the most important and prevalent standards: POSIX and the Single UNIX Specification (SUS). It is as old as computers themselves. When the systems running our voting is proprietary or closed, it means that …

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How to set up the Perl environment on Ubuntu

It may use the API as-is, or not use it at all: take it or leave it! The device identifier for /dev/hdb, the slave IDE drive on the primary IDE controller is (3,64). awk is actually a programming language designed particularly for text manipulation, but it is widely …

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Understanding the library linker game

Becoming familiar with Linux can result in a substantial financial savings because the software (both the operating system and the application programs) is available for free and because Linux can run on older and cheaper computers. In 1978, Kernighan and Ritchie wrote, "The C Programming Language," a book that is …

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Its all about rdate

As such it is possible to have two or more files and directories with the same name but letters of different case. I say somewhat, because the use of sed in conjunction with pipes is somewhat more comfortable (at least to this author) for substitution of text in files. Software …

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Minimize speed when using your first accepted version

Hard links allow for complex filesystem structures with multiple pathnames pointing to the same data. You may need to go through several rounds of resubmission and additional feedback before your code is accepted, and in some cases it may be rejected. Share your personal experiences (good and bad) with Linux …

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Understanding the fundamentals of CUPS

The smallest addressable unit on a block device is the sector. With the connection established both ends are free to send and receive data. When it is started up, usually at system boot time, it opens up an Inter-Process Communication (IPC) channel to the kernel. At kernel initialization time, the …

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Get rid of declare once and for all

The default action for the SIGFPE signal will core dump the process and then cause it to exit. Any of the bytes within a file may be read from or written to. Through virtual memory and paging, the kernel allows many processes to coexist on the system, each operating in …

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Getting up and running with Lumina

The read/write heads are moved across the surface of the platters by an actuator. The Linux kernel, supporting both preemptive multitasking and virtual memory, provides every process both a virtualized processor and a virtualized view of memory. Other common sections in ELF executables are the absolute section (which contains …

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Getting started with syslogd on Arch Linux

Unlike Windows, Linux requires each user to have an account. Linux keeps looking through the pending list from the start until there is a pass where no semaphore operations can be applied and so no more processes can be woken. Effectively, they define system programming, or at least a common …

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Does it run under KDE on the Linux Lite distro?

An alternative to purchasing a Linux book is to borrow one (or many) from a library; it is likely that some of them will also contain CDROMs that can be used to install Linux. And the vast profits being amassed by some of those corporations added to the frustration. Instead …

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Using more to view text files at the BeatrIX command line

Processes are free to use a FIFO so long as they have appropriate access rights to it. You can customize the terminal, try different text editors, and install desktop environment of your choice. These accounts are combined in to groups to help simplify their management. Every process runs as a …

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Scan the results of parameter expansion

The new vm_area_struct structure is put into the list of vm_area_struct pointed at by the shmid_ds. Some such devices are partionable, which means that they can be divided up into multiple filesystems, all of which can be manipulated individually. Sustainable technologies are also important, and the best example of the …

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Principles of LTTng-Tools under Linux

However, such programs are typically also made available for free (usually as a free download from the Internet). For example, on your computer, as a normal user you may have permission to access other files on the system. This waiting happens within the system call, in system mode; the process …

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Getting acquainted with Miracle Linux

The module data structure is marked as DELETED and it is unlinked from the list of kernel modules. Most licenses of the proprietary software systems are expensive and should be renewed every year. These range from simple memory protection schemes to complex page hierarchies. You don't need to spend tons …

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Getting the best out of atq when using Ubuntu

Therefore Linux adds a call to a tidy up routine which will restore the original blocked mask onto the call stack of the signalled process. If your computer came with a copy of Windows, then you paid for it, even if the store didn't tell you about that. This credit-card …

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No more mistakes with dnssec-keygen

If the name doesn't give it away, Linux containers, a method of packaging and isolating an application with only its dependencies, are a technology built from key pieces of the Linux kernel. Still, this survey does compare Windows 2000, GNU/Linux (up to 497 days usually), FreeBSD, and several other …

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Principles of git-series under Linux

First of all the DMA controller knows nothing of virtual memory, it only has access to the physical memory in the system. If they will then it removes the sem_queue data structure from the operations pending list and applies the semaphore operations to the semaphore array. Institutions that rely solely …

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Sick and tired of using suspend the same way?

If you're interested in writing code for the Linux kernel itself, a good place to get started is in the Kernel Newbies FAQ, which will explain some of the concepts and processes you'll want to be familiar with. This chapter describes how the Linux kernel manages the physical devices in …

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A simple guide to ld

You can customize the terminal, try different text editors, and install desktop environment of your choice. The results of such concurrent accesses rely on the ordering of the individual operations, and are generally unpredictable. Writing a byte to the middle of a file overwrites the byte previously located at that …

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The ultimate guide to sdiff

If you find a bug, report it! On i386, for example, a user-space application executes a software interrupt instruction, int, with a value of 0x80. However, such programs are typically also made available for free (usually as a free download from the Internet). Maybe it's a Linux firewall on a …

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Linux adventures with amixer

Even so, most software developers, even those who have grown up during this venerable "Linux revolution" have at least heard of Unix. While early drones relied on proprietary operating systems, the boom in drone flight is helped onward by Linux, which provides the tiny embedded operating systems necessary to run …

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Starting the portmap/rpcbind daemon at boot time

Like interrupts, some devices have a fixed DMA channel. Most processes consist of only a single thread; they are called single-threaded. The data is read by a head, which can detect whether a particular minute particle is magnetized. On GNU/Linux systems a file command can be used to identify …

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Determine hardware resources for devices

Python has always touted itself as a "batteries included" language; its standard library contains lots of useful modules, often more than enough to solve many types of problems quickly. To understand what OSS is, you must first understand how source code is used to create programs. In all cases, bash …

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Creating a SPEAKUP_DOCS.TXT file for your distro

Its latest releases often inspire the other Linux distributions to adopt new features and make changes. Just as IP packets have their own header, TCP has its own header. This integration would result in efficient administration. However, there is a fundamental difference: free software retains its copyright and is released …

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