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Brother is well known for its affordable compact laser printer lineup. You can get a high-quality WiFi/duplex-capable laser printer for less than 200USD, and the price keeps going down. On top of that, they provide reasonably good Linux support, so you can download and install their printer driver on your Linux computer.

LVM is a logical volume management tool which allows you to manage disk space using the notion of logical volumes and volume groups. The biggest benefit of using LVM over classic partitions is the flexibility in allocating storage for users and applications without being constrained by the size of individual physical disks.

In Ubuntu desktop, its desktop environment settings, including system proxy settings, are stored in DConf database, which is a simple key/value store. If you modify any desktop properties using System Settings menu, the changes are persisted in the DConf database backend. There are GUI-based or non-GUI-based ways to modify DConf database on Ubuntu.

The modern Internet is infested with various malicious robots and crawlers such as malware bots, spambots or content scrapers which are scanning your website in surreptitious ways, for example to detect potential website vulnerabilities, harvest email addresses, or just to steal content from your website. Many of these robots can be identified by their signature "user-agent" string.

Threads are a popular programming abstraction for parallel execution on modern operating systems. When threads are forked inside a program for multiple flows of execution, these threads share certain resources (e.g., memory address space, open files) among themselves to minimize forking overhead and avoid expensive IPC (inter-process communication) channel. These properties make threads an efficient mechanism for concurrent execution.

A torrent file (i.e., a file with .torrent extension) is a BitTorrent metadata file which stores information (e.g., tracker URLs, file list, sizes, checksums, creation date) needed by a BitTorrent client to download files shared on BitTorrent peer-to-peer networks. Inside a single torrent file, one or more files can be listed for sharing.

If your music player does not display some MP3 tracks correctly (e.g., with garbled symbols), it is most likely that the character encoding of ID3 tags is not supported on your Linux system. You can often encounter this problem when song titles or artist names are written in Cyrillic, Greek, Chinese, Japanese or Korean characters.

There are many commercial VPN gateways available, which come with their own proprietary VPN client software. While there are also open-source VPN server/client alternatives, they are typically lacking in sophisticated IPsec support, such as Internet Key Exchange (IKE) which is a standard IPsec protocol used to secure VPN key exchange and authentication.

autossh is an open-source tool that allows you to monitor an SSH session and restart it automatically should it gets disconnected or stops forwarding traffic. autossh assumes that passwordless SSH login for a destination host is already setup, so that it can restart a broken SSH session without user's involvement.

Network bridge is a hardware equipment used to interconnect two or more Layer-2 network segments, so that network devices on different segments can talk to each other. A similar bridging concept is needed within a Linux host, when you want to interconnect multiple VMs or Ethernet interfaces within a host. That is one use case of a software Linux bridge.

HTTP-encapsulated tunnels are useful when you want to use games, IM clients, or P2P sharing applications across restrictive firewalls or proxies which tend to block pretty much everything except well known traffic such as HTTP traffic.

Modern hypervisors enable efficient resource sharing among multiple guest operating systems by virtualizing and emulating hardware resources. However, such virtualized resource sharing may not always be desirable, or even should be avoided when VM performance is a great concern, or when a VM requires full DMA control of a hardware device.

Image resolution of today's picture taking gadgets (e.g., smartphones, digital cameras) keeps increasing. Even 36.3 Megapixel Nikon D800 recently hit the consumer market, and this trend will continue. While modern gadgets continue to produce increasingly high resolution images, we may often want to post-process and compress their sizes before uploading them to a storage-limited and bandwidth-restricted cloud.

Nowadays teleworking or remote working with flexible hours is increasingly popular in tech industry. One of the enabling technologies behind this trend is remote desktop. Your desktop environment is in the cloud, and you can access the remote desktop anywhere you go, either from home or at your workplace.

IPv6 has been introduced as a replacement of IPv4, the traditional 32-bit address space used in the Internet, to solve the imminent exhaustion of available IPv4 address space. However, since IPv4 has been used by every host or device connected to the Internet, it is practically impossible to switch every one of them to IPv6 overnight. Numerous IPv4 to IPv6 transition mechanisms (e.g., dual IP stack, tunneling, proxying) have been proposed to facilitate the adoption of IPv6.

If you want to take pictures or record videos using Raspberry Pi board, you can install Raspberry Pi camera board. If you do not want to shell out money just for the camera board module, there is yet another way, which is to utilize a commonly found USB web camera. You may already have one for your PC. In this tutorial, we show how to set up a USB web camera on Raspberry Pi board. We assume that you are using Raspbian operation system.

Before installing full kernel source on your Linux system, ask yourself whether you really need the full kernel source. If you are trying to compile a kernel module or a custom driver for your kernel, you do not need the full kernel source. You only need to install matching kernel header files, and that's it.

To access a MySQL server, you need to log in to the server using a user account. Each MySQL user account has a number of attributes associated with it, such as user name, password, as well as privileges and resource limits. Privileges are user-specific permissions defining what you can do inside a MySQL server, while resource limits set the limitations on the amount of server resource allowed for for the user. Creating or updating a MySQL user involves managing all these attributes of the user account.

When it comes to optimizing the performance of a Linux system, physical memory is the single most important factor. Naturally, Linux offers a wealth of options to monitor the usage of the precious memory resource. Different tools vary in terms of their monitoring granularity (e.g., system-wide, per-process, per-user), interface (e.g., GUI, command-line, ncurses) or running mode (e.g., interactive, batch mode).

Depending on your need, there are various pieces of information you may need to know about the CPU processor(s) of your computer, such as CPU vendor name, model name, clock speed, number of sockets/cores, L1/L2/L3 cache configuration, available processor capabilities (e.g., hardware virtualization, AES, MMX, SSE), and so on.