Archives for June 2022

lolcat is a program that concatenates files, or standard input, to standard output (like the generic cat), and adds rainbow coloring to it. In case you encounter the below error: lolcat: command not found you may try installing the below package as per your choice of distribution. Distribution Command OS X brew install lolcat Debian […]

SMB, also known sometimes as CIFS, is the protocol in charge of providing shared access to files and printers on Windows networks. To make things simpler we use both terms interchangeably. This service can run directly over TCP port 445, but it can also use the NetBIOS API. The Linux CIFS filesystem is composed of […]

The Problem Getting below error message when trying to mount a filesystem: # mount /dev/mapper/vg-lv /mnt mount: /mnt does not contain SELinux labels. You just mounted an file system that supports labels which does not contain labels, onto an SELinux box. It is likely that confined applications will generate AVC messages and not be allowed […]

YUM (short for Yellowdog Updater Modified) is an open source tool that was developed by Red Hat Inc for RPM-based systems. It is a high-level package management tool that’s used for easily installing, removing, updating, or searching software packages on systems or in network repositories. It allows us to use a CentOS base and third-party […]

At one point or another, you have used a joystick or a gamepad of a video console. A joystick is nothing more than a series of buttons and potentiometers. With this device, you can perform or control a wide range of actions. When you connect your joystick to your computer, you are going to check […]

jq is a lightweight and flexible command-line JSON processor much like sed in that it enables you to slice, filter, map, and transform data from one format to another. For instance, it can be used to convert JSON data into CSV (comma-separated values) for loading into a non-JSON–columned MySQL database. You can download it from […]

Debian’s package management system uses the dpkg command to install, remove, and query packages. dpkg-deb is a backend command for building and managing Debian package archives. You’ll often want to use dpkg to pass commands through to dpkg-deb, rather than call dpkg-deb directly. If you encounter below error: dpkg-deb: command not found You may try […]

Quick Emulator (QEMU) is the main component of the QEMU/KVM virtualization technology suit. It provides hardware virtualization and processor emulation. QEMU runs in userspace and, without the need for kernel, drivers can still provide fast system emulation. QEMU supports two operating modes: Full system emulation, where QEMU emulates an entire computer system, including the CPU […]

The traditional Linux and Unix way for finding code coverage is to use gcov to generate the coverage map and lcov to make the output pretty. Code coverage measures if, and if so, how many times, a line of code is executed. This is useful for measuring the efficacy of your test code. In theory, […]

Installed with PulseAudio are the PulseAudio utilities (pulseaudio-utils package). These are command-line utilities for managing PulseAudio and playing sound files. The paplay and pacat will play sound files; pactl will let you control the sound server; and pacmd lets you reconfigure it. Check the man pages for each for more details. Sound Tool Description pabrowse […]