There are two basic concepts in Linux - processes and files. The processes do things and files keep all the important data. An efficient filesystem is important for an operating system. When Unix was conceived around 1969-70, several design decisions were taken to simplify the filesystem.… Read more
Raspberry Pi 4B has a Display Serial Interface (DSI) port for connecting a Raspberry Pi touchscreen display using a ribbon cable. In this post we will look at the process of connecting the Raspberry Pi 7" touchscreen display with the Raspberry Pi 4B single board computer.… Read more
The uname command prints information about the system. uname is a portmanteau word made up from "unix" and "name". uname can be called from the command line in Linux as,
uname [OPTION]...
The most common way to use uname is with the -a option, which stands for "all" the information.… Read more
Raspberry Pi is a popular single board computer developed by the Raspberry Pi Foundation in the U.K. Raspberry Pi 4 Model B (Pi4B) was released in June 2019. The main components of Pi4B are:
After installing Ubuntu Linux on a laptop with screen resolution 1920x1080 pixels or more, you may find that the icons and text appear to be small. You can alleviate the problem by taking the following steps.
$ sudo add-apt-repository universe $ sudo apt-get install gnome-tweak-tool
Wacom One CTL-672/KO-CX tablet was not connecting with a laptop running Ubuntu Linux 18.04 LTS. It was working fine earlier, with the wacom driver obtained from the Linux Wacom Project. The Linux kernel on the laptop had been updated recently.… Read more
Wacom One CTL-672/KO-CX is an 8.5 inch x 5.3 inch graphic tablet which can be connected to a computer via a USB port. The tablet comes with a pressure sensitive cordless pen. Once connected to a computer via a USB port, pen and tablet work like a mouse on a mouse pad, giving a very fine pointer on the screen.… Read more
After the update of Linux on the web server, the website would not open in the browser. Instead the following error was displayed.
502 Bad Gateway nginx/1.14.0
First we check the nginx server.
$ systemctl status nginx ● nginx.service… Read more
The problem of removing leading and trailing whitespace characters in strings occurs in programming quite often. Here is a solution.
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
void trim (char *dest, char *src);
int main (int argc, char **argv)
{
char inbuf [1024];
char outbuf [1024];
printf ("Type a string : ");
while (fgets (inbuf, 1024, stdin) !=… Read more