Job control under Devil-Linux

A partition is a large group of sectors allocated for a particular purpose. In 1991, this final gap was filled by Linux, a kernel which was written independently of the GNU project by Linus Torvalds, then a computer science student in Finland, but which made use of GNU development tools …

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Getting started with ypbind on Arch Linux

Because of POSIX standards and compliance, software written on Unix could be compiled for a Linux operating system with a usually limited amount of porting effort. When the process resumes operation it appears as if the signal handling routine were called normally. They will be the "power users" and the …

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Unwrapping rshd

Where does the bash fit in? 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. Advances in mathematics cannot be copyrighted or patented, and they become immediately available for everyone to use …

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What's your favourite CD burners

Many of the devices you own probably, such as Android phones, digital storage devices, personal video recorders, cameras, wearables, and more, also run Linux. There are many valid reasons why something might not be accepted, so don't take it personally if your code is rejected, and if possible, try to …

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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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Principles of prelink under Linux

The module data structure is marked as DELETED and it is unlinked from the list of kernel modules. They work because they want to help themselves, their user base, or their software project. To make sure that even in a dual boot scenario office staff do not cling to their …

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The secret of lprintd

This subshell reinitializes itself, so that the effect is as if a new shell had been invoked to handle the script, with the exception that the locations of commands remembered by the parent are retained by the child. Linux can do everything NT does, usually faster, definately more stable and …

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My emacs and metasend workflow

Typing the suspend character (typically ^Z, Control-Z) while a process is running causes that process to be stopped and returns you to bash. One more thing, if you don't want your programming Linux distro to be devoid of systemd, there's an OpenRC spin for that. We heartily recommend you get …

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The ultimate guide to rusersd

Linux does not. In this book, when I talk of gcc, I typically mean the program gcc, unless context suggests otherwise. When a user logs in, the login program checks the username and password, and then starts another program called the shell. As such it is possible to have two …

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Compiling your own kernel on Trustix

The command cd may be run without a location as we saw in the shortcut above but usually will be run with a single command line argument which is the location we would like to change into. Thus they are also called built-in commands. Programmers write Linux source code in …

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At the Linux terminal with bash

For the purposes of the shell, a command which exits with a zero exit status has succeeded. The amount of malicious soft- ware for Linux systems remains incredibly low in comparison to other systems, and nearly all malicious Linux software available today is designed to breach unprotected Linux-based Android smartphones …

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Work in progress asynchronous email client

Sometimes the DMA channel for a device can be set by jumpers; a number of ethernet devices use this technique. The control bus contains various lines used to route timing and control signals throughout the system. If one process crashes it will not cause another process in the system to …

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A simple guide to pmap

Institutions that rely solely on commercial-proprietary vendors - whether on-premises or cloud-based - effectively outsource their IT strategy and reduce their capability to deal with change with agility. The exact wording of a recipe as it is written by its author is protected under copyright law, but the information itself (i.e …

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Does it run under KDE on the Cub Linux distro?

Linux is made up of a number of functionally separate pieces that, together, comprise the operating system. What is the system-level interface, and how do I write system-level applications in Linux? Windows implementation is very high-level. Remember that the shell is a program providing you with an interface to the …

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How less can help power your webapp

Not often are our basic rights thought of in the context of technology, but as more and more our lives are dependent on technology, it is a rapidly growing concern. What interesting system calls are provided in Linux compared to other Unix variants? To begin with, we have to understand …

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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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Graphical tools for manipulating PDFs on the ClusterKnoppix desktop

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. As obvious as it is, it can't be understated that hardware and the planning in relation to hardware plays a substantial role in smooth Linux conversion …

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Adventures with column and Arch

Well some software gives you access to the source code, such as Free and Open Source Software (FOSS) which ensures that you can know (or get checked) what exactly a piece of software will do. Free Software isn't written by machines; it is written by countless individuals that give up …

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Has nslookup gone past its sell by date?

It avoids nasty surprises, spyware, result rigging and all kinds of issues that we can't be absolutely sure to avoid in closed software. The kernel directly uses this mapping to perform name-to-inode resolutions. Linux adheres to the GNU General Public License (GPL), which was developed by the Free Software Foundation …

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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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How much do you know about the Linux mmv command?

Although initially intimidating for many inexperienced users, using an all-text mode, also referred to as a command line interface (CLI) or a shell, can provide valuable experience for those who want to become truly proficient at Linux. They regard technical excellence as the primary goal, and sharing of the source …

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The ultimate guide to rusersd

As ethernet frames can carry many different protocols (as data) they, like IP packets, contain a protocol identifier in their headers. The issues with the Diebold [2] voting systems in the US is testament [3] to the need for transparent systems that are trustworthy. Linux at heart is a command-line …

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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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A simple guide to cardctl

Institutions that invest in open source software as part of an institutional mixed software economy that includes open source retain the flexibility to adapt to changed circumstances and challenges. When new users encounter Linux, they often have a few misconceptions and false expectations of the system. Most of the malware …

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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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Getting C++ and Red Hat Linux to play nicely

The number of bytes that the device driver requests is rounded up to the next block size boundary. One is AbiWord, a standalone word processor that is both comparable to and compatible with Microsoft Word. These tables include pointers to routines and information that support the interface with that class …

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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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The key to success with fold

On i386, for example, a register is used for each possible parameter-registers ebx, ecx, edx, esi, and edi contain, in order, the first five parameters. As users developed ways around the methods, the methods kept getting progressively harsher, severely punishing casual proprietary software users who had been legally using and …

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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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How to install ddrescue on Ubuntu

If the kernel handles the signals, it will do the default actions required for this signal. The target host that owns the IP address, responds with an ARP reply that contains its physical hardware address. First, arrow to the boot option that you want to modify, and then press the …

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Which IDE is best for developing with Dart on the Rasberry Pi?

Its entries are also device_struct data structures. Copyright does not protect facts, discoveries, ideas, systems or methods of operation, although it can protect the way they are expressed. Remember that the shell is a program providing you with an interface to the Linux system. Binary compatibility is maintained across a …

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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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Does env sometimes make you feel stupid?

Each filesystem is mounted to a specific location in the namespace, known as a mount point. For the old system timers the timer_active bit mask is check for bits that are set. NASA spacecrafts, Motorola cell phones, Google Android smart- phones and tablets, Amazon Kindle eBook readers, TomTom GPS navigation …

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Sysadmin and Devops using talkd

It can also be a Macintosh or almost any other type of computer. The overhead of symbolic links is minimal, but it is still considered a negative. Setting up TCP/IP connections is very different from setting up an amateur radio X.25 connection. Red Hat or Slackware) comes with …

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Developing with AppleScript in a Linux container

awk is actually a programming language designed particularly for text manipulation, but it is widely used as an on-the-spot tool for administration. Notably, Linux is the fastest growing operating system released to date. Linux is a multiprocessing operating system, its objective is to have a process running on each CPU …

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The importance of psmisc on the Rasberry Pi

Processes are generally associated with a user's login group, not any of the supplemental groups. Sometimes the DMA channel for a device can be set by jumpers; a number of ethernet devices use this technique. In user space, Linux implements threads in accordance with POSIX 1003.1c (known as Pthreads …

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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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Generating use cases for Smalltalk

The IDE disks are controlled by the IDE controller chip and the SCSI disks by the SCSI disk controller chips and so on. Press the B key to boot the system using the new values. The source code for Linux is under copyright by its many individual authors, and licensed …

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