Ubuntu is a multi-user operating system. Multi-user operating system means, it can be used by more than one person at a time while running on a single machine. A multi-user operating system is an operating system that allows multiple users to connect and operate a single operating system. In this tutorial, you will learn How …
How to Add and Delete Users on Ubuntu 20.04 / 18.04 / 16.04 Read More »
How to Switch Between GDM and LightDM or other display managers in Ubuntu. To switch between gdm3 and LightDM. Your system should have already installed gdm3 and lightdm. Earlier LightDM was default display manager of Ubuntu. But from Ubuntu 20.04 comes with gdm3 as the default display manager. To install gdm use this command sudo apt …
GDM (GNOME Display Manager) The GNOME Display Manager (GDM) is a program that manages graphical display servers and handles graphical user logins. GDM3:- GDM3 is the default display manager for GNOME Desktop which manages the graphical display servers and user logins. GDM do not include any XDM code and was written from scratch. Features of …
VSFTPD ( Very Secure File Transfer Protocol Daemon ) is an FTP server on ubuntu. It is a default FTP server in Ubuntu, CentOS, Fedora, NimbleX, Slackware and RHEL Linux. It is licensed under the GNU General Public License. VSFTPD is Optimized for security, performance, and stability, and it protects against many security problems found …
How to install FTP server (VSFTPD) on Ubuntu 20.04 / 18.04 / 18.10 / 19.04 / 19.10 Read More »
Constant values used within a program are known as Literals. These constant values occupy memory but do not have any reference like variables. There are four types of literals in C Integer literal Float literal String literal Character literal Integer literal Integer literals are used to represent and store the integer values. Integer literal is followed …
An operator is a symbol that helps us to perform specific mathematical and logical computation operation on a value or a variable. There are following types of operators to perform different types of operations in C language. Arithmetic Operators Relational Operators Logical Operators Bitwise Operators Assignment Operators Other Operators Arithmetic Operator An arithmetic operator performs …
Identifier refers to name given to different entities such as constants, variables, structures, functions, etc. Example int age; double mobile_number; Here age and mobile_number are identifier. int and double are data type. Rules for naming Identifier We cannot use keywords as identifier. The first letter of an identifier should be either a letter or an …
Storage class determines the scope, visibility, memory location, default value and lifetime of a variable or function. A storage class in C is used to describe the following things. Variable’s scope. Location where the variable will be stored. Initialized value of a variable. Lifetime of a variable. Who can access a variable? There are four …
Keywords are predefined, reserved words used in programming that have special meanings to the compiler. It helps us to use the functionality of C language. We cannot use it as a variable name, constant name, etc. There are 32 reserved keywords in the C language. ** All keywords must be written in lowercase. Table of 32 …
A constant is a variable whose value cannot be changed after its definition. Constants in C are the fixed values and its value remains unchanged during the entire execution of the program. Generally, we use const keyword to create a constant. There are two Ways in C to define constants Using const keyword. Using #define preprocessor. Constants are also …