The bmon is a command line tool that allows to monitor network bandwidth. This tool can listen to the network traffic on multiple interfaces at the same time. Bandwidth usage...

A rootkit is a type of malware that is used to enable unauthorized access to a system. The chkrootkit is a command line tool that scans system in order to...

The hwinfo is a command line tool that can be used to get details about various hardware components on a system. It provides information about CPU, RAM, disks, network interfaces...

Reading and analyzing the log files in white text on a black background can be difficult and take a lot of time. Colorized log files is one of the solutions...

There are many devices and microcontrollers which requires a 3.3V DC power supply for proper operation. This post presents circuit of 5-15V to 3.3V converter using LD1117V33 voltage regulator. This...

There are many types of emergency vehicle lights that installed on police cars, fire engines, ambulances, etc. This post presents circuit for blinking alternately the two red LEDs and two...

This post presents circuit of electronic coin toss also known as coin flip circuit or heads or tails circuit. When the push-button is pressed, the LEDs will start blinking fast...

We can send ICMP requests to another host to test whether host is reachable. However, ICMP requests can be blocked by firewalls. The arping is a command line tool that...

The wavemon is a command line tool that allows to monitor a wireless network devices. This tool enables to view wireless signal strength and noise levels, packet statistics, information related...

When working with high voltage circuits is useful to have a non-contact voltage detector also known as tester which enables to detect the presence of voltage without direct contact. This...