The ultimate guide to deallocvt

Many developers believe this open-source model makes Linux inherently more secure than a proprietary operating system. Likewise, the smallest logically addressable unit on a filesystem is the block. Even in the days before the Internet, information and so-called "intellectual property" could still be, and were, exchanged. Public domain refers to …

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Job control under Slackware

It contains a compressed kernel image which is used to control the hardware during installation. Its own Software Center has tons of free applications that make it a great Linux OS for programming. Partitioning a disk allows the disk to be used by several operating system or for several purposes …

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How much do you know about the Linux objcopy command?

From the kernel, of which a substantial part of it is written in C, to lots of everyday user-land applications, C is used massively on your Linux system. Voting, commerce, medical records, tax calculation and collection, entertainment, all are affected by computers. All bytes in a section are treated the …

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Running sshd inside a docker image

In many cases, the software's creator may have made a Linux version of the same program you use on other systems. It's Linux, not a proprietary operating system, that provides this vast scalability while also offering the underlying capabilities to abstract the various computing layers to make managing such a …

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At the command line with numactl

Every process except the first has a parent. Every transmitted ethernet frame can be seen by all connected hosts and so every ethernet device has a unique address. There is also the reverse function, Reverse ARP or RARP, which translates phsyical network addresses into IP addresses. This pragmatic approach forces …

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Get the most out of Freesco

Very little Free Software would be written, and that which was written may not be released to the public. (See "Shell Built-in Commands.") Readline has variables that can be used to further customize its behavior. Sections are linear chunks of the object code that load into linear chunks of memory …

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Getting your CD burners up and running on Linux

What most of us call "files" are what Linux labels regular files. It stands to affect the people of the world at least as profoundly as the Industrial Age. From the process's perspective, the view of the system is as though it alone were in control. This operation is called …

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Redirecting output with G2Linx

Almost certainly, but it's doubtful that it would maintain the presence that Android currently enjoys in today's consumer market. For the old system timers the timer_active bit mask is check for bits that are set. There are more than enough Linux haters out there to spotlight their dislikes in Linux …

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How to evaluate error messages with less

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. Thus, there is no term free mathematics. Outsource open source software development to O2I and benefit from …

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Running sendmail inside a docker image

Some cross-site-scripting attacks are possible when the attacker finds a weak spot in your source code and they can even leave the malicious code dormant for a long time before executing it. Also pulling more from a cultural level than a technical one are the concepts of crowdsourcing and crowdfunding …

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Learn mesg to further your career

You can also edit boot options on the fly from the GRUB menu. The operating system then uses the computer hardware to perform the tasks required by the applications. These are independently developed pieces of software that work with the kernel in order to function as a complete operating system …

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Getting started with inetd on Arch Linux

Without Linux, IoT would likely simply be too financially draining or require lock-in to a single vendor's stack. Fortunately for us there is an easy to use resource that can inform us about all the great things we can do on the command line. Some such devices are partionable, which …

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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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Tips and tricks for using CUPS for printing with Knoppix

We who are enthusiastic about GNU/Linux want to spread that freedom around. However, this is no less "programming" than anything else. Recently, Linux has replaced this security system with a more general capabilities system. Because it is free software, licensed under the GNU General Public License, Linux obviates the …

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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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Open the gates for strip

The API merely defines the interface; the piece of software that actually provides the API is known as the implementation of the API. Most recently, the U.S. Before I became involved in Free Software, I had far different opinions, ideas, and beliefs than I do today. This highly stable …

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Getting up and running with Gnome Flashback

Its purpose is to provide a financial incentive for producing such works in order to benefit society as a whole. How does the kernel know which directory to look in to find a given filename? Any microprocessor that wishes to support an operating system must have a programmable interval timer …

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Booting ClusterKnoppix faster

You can code one version of your software and give it away freely, yet still maintain a commercial version with enhanced features. This tutorial is organised as such, with each section building upon the knowledge and skills learned in the previous sections. Dynamically loading code as it is needed is …

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A technical overview of mtr

Software running on the CPU must be able to read and write those controlling registers. Each process is in turn associated with exactly one uid, which identifies the user running the process, and is called the process's real uid. For many people, the next step will be to carefully read …

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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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Getting the best out of env when using Ubuntu

The mini-bootloader acts as a middleman in the boot process. If you hit Tab again it will show you those possibilities. Even if you are an aged UNIX guru, what follows is probably of interest to you. If a match is found, that builtin is invoked.

A lazy person's guide …

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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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Focus on the outcome when using ram

Every program that is running is called a process. A process's resources, along with data and statistics related to the process, are stored inside the kernel in the process's process descriptor. I use Linux for everything. Accepting Linux need not mean using it or even liking it.

Running swapper inside …

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Understanding the fundamentals of xfsdump

Its one-time installation is sufficient and every time a new version is released (very early every month), you get an updated machine. Background processes are those whose process group ID differs from the terminal's; such processes are immune to keyboard-generated signals. There will always be at least two kinds of …

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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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Can you recommend a Web browser for the Raspberry Pi?

The entire Linux kernel was written from scratch, without employing any code from proprietary sources. Instead of a simple binary check, capabilities allow the kernel to base access on much more fine-grained settings. The most popular include Perl, Python, PHP, and Tcl. If you can use a computer or other …

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Can you get Gnome to work on your own distro?

Linux moving into the mainstream is a great thing. Background processes that attempt to read from (write to) the terminal are sent a SIGTTIN (SIGTTOU) signal by the terminal driver, which, unless caught, suspends the process. Another excellent source for assistance (and encouragement) is a local Linux Users Group (LUG …

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Running Gnome on CentOS

A thread is the unit of activity within a process. This is also the reason serious Linux users prefer the command line. However, such programs are typically also made available for free (usually as a free download from the Internet). lsmod simply reformats /proc/modules which is built from the …

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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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Does it run under KDE on the Linux Mint distro?

If the kernel handles the signals, it will do the default actions required for this signal. The first method is most often the easiest, as long as your system UEFI boot manager allows you to disable the secure boot feature. The kernel allocates a new module data structure and enough …

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Getting started with systemd on Ubuntu

There are editors, compilers and interpreters for nearly every language ever created, debuggers, parser generators, you name it. What exactly do the kernel and the C library provide? Whereas it had previously been the norm to assist colleagues and freely share ideas and software, such cooperation suddenly became forbidden and …

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Linux CLI goodness with yum

The system itself is designed with a very open-ended, feature-minded approach. I moved on to larger applications and contributions. Other drivers can be loaded as kernel modules when they are needed. It would not be enough to stop here, though.

Get the most out of ClusterKnoppix

Developing the core is …

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Principles of rpcbind under Linux

In Linux, blocks are generally larger than the sector, but they must be smaller than the page size (the smallest unit addressable by the memory management unit, a hardware component) Common block sizes are 512 bytes, 1 kilobyte, and 4 kilobytes. Even so, most software developers, even those who have …

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