Definition Regular expressions (regex) are a powerful tool in Python that are used for matching desired patterns in strings/text. Features regex allow to search, match, and manipulate strings based on patterns. We can test our regex patterns using tools like regex101.com. ‘re’ Package/Module Functions Python provides the ‘re‘ (regular expression) module/package, Read more…
Definition In Python, a string is a sequence of characters enclosed within single (‘ ‘), double (” “), or triple quotes (”’ ”’ or “”” “””). Strings are immutable, i.e. they cannot be changed after creation. Strings in Python are powerful and come with many built-in methods for manipulation. String Read more…
Example : A Python program to display the Message/Values using a Class and an Object. Example : A Python program to display the sum of two values using a Class and an Object. Example : A Python program to display the sum of two values using Multiple objects. Example : Read more…
Firewalls are critical for securing Linux systems by controlling incoming and outgoing network traffic based on predefined rules. A firewall is a security system that monitors and controls network traffic. Linux firewalls operate at the kernel level using Netfilter, a packet-filtering framework. Firewalls perform filtering i.e., It blocks or allows Read more…
DNS DNS(Domain Name System) is a hierarchical system used to translate human-readable domain names (e.g., example.com) into their respective machine-readable IP addresses (e.g., 192.0.2.1). In other words, a DNS Server resolves domain names into IP addresses and vice versa. Structure/Components of DNS DNS consists of several components:- Zones and Domains: A Read more…
Partitioning is essential for organizing disk storage in Linux. It allows us to efficiently allocate space for the operating system, swap, data storage, and other purposes. Disk Storage and Devices Storage devices in Linux are represented by device files: HDD/SSD: /dev/sda, /dev/sdb, etc. Partitions: /dev/sda1, /dev/sda2, etc. Storage types in Read more…
Linux permissions are a fundamental aspect of system security and user management. Basic Linux Permissions Linux employs a three-tiered permission system to control access to files and directories. Each file or directory has three main permission types: Permission Types Read (r): This permission allows viewing the contents of a file Read more…
Example : A program in VB .Net to show both Subroutine and Function Procedure. Example : A program in VB .Net to show Parameterized Subroutine Procedure. Example : A program in VB .Net to show Non-Parameterized using Subroutine Procedure. Example : A program in VB .Net to show Optional and Read more…
Users and their Types (A.) Users and their Types in Linux Understanding user types and their roles is critical for securing and managing a Linux system effectively. In Linux, users represent accounts that can log into and perform operations on the system. Users are a fundamental concept in Linux for Read more…