A regular expression, also called regex, is a way or a method of identifying a string from a given text according to certain rules. A regex is physically represented by a string formed from a bunch of characters. Rules: 1. The fundamental block is a single character and selects itself. 2. A bracket expression is a character list enclosed between “[” and “]” and describes a...

A regular expression or regex is a method of identifying a string from a given text according to certain rules. A string that consist of special characters physically represents a regex. Rules: 1. The fundamental block is a single character and selects itself. 2. A bracket expression is a list of characters between “[” and “]” and describes a certain character in that list...

One of the main tasks that the Kernel does is to allocate resources (RAM, CPU) to various applications. A process represents the elemental resource allocation unit in the system and runs in its own memory space. When a command is executed, a new process is created. The father of that process is the current shell. Process image is the program that runs and is loaded into RAM. There are differences...

In Linux operating systems, archiving and compression are two separate terms. Archiving means creating a file containing multiple files and directories to make the copy operation much more accessible. Compression means compressing data to take up less space. In Linux, the tar command is used for archiving, and for compressing gzip or bzip2. The gzip command uses Lempel-Ziv encoding (LZ77), and...

In addition to standard permissions (read, write, and execute), there are the following special permissions: 1. SUID (setuid). It is a special permission for executable files. In Linux, an executable file has the same rights as the user who executes it. Setting the SUID bit, when executed, the file has the rights of the owner and not the owner of the file. SUID files set up with owner root are a...

Filesystems are the way to organize, structure and access files, directories, and links to your hard drive. How to organize, access and recognize the particularities of each file system falls under the Kernel. It has to “provide support” for that file system. Currently Linux kernel recognizes most existing file systems: fat16, fat32, ntfs, ext2, ext3, reiserFS, nfs, smb, iso9660 etc...

F-PROT offers both Home and Enterprise editions of its antivirus. However, only the home version is free. Features:     1. Scan on demand     2. Planned scans     3. Protection against trojan and boot sector viruses     4. Supports internal HDD and SSD Benefits:     1. Supports both 32-bit and 64-bit systems     2. Comprehensive threat manager     3. Low impact on performance     4. Portable...

Avast already has a fantastic reputation, being a decent Windows antivirus, and its Linux software is no different. Both versions have the same malware database and passed the AV test for anti-malware and anti-spyware programs with the 10th mark. Features:     1. Real-time protection     2. Scanning on Demand     3.Scanning the scan     4. Basic protection     5.Security of the network     6...

An antivirus program for Linux is ClamAV. ClamAV – I think it’s the most used antivirus software for Linux. Free and open source, it scans both Linux files and, most importantly, Windows files (mounted partitions, other hard drives, USB devices). ClamAV works through the command line, which could be a little complicated for an average user. Fortunately, there is a tool called ClamTK...

There is an eternal controversy between Linux users: do we need an antivirus in Linux? In Windows, it’s clear that without an antivirus, that PC will get viruses. When the computer shuts itself down, strange windows with text that you do not understand, or tens of windows that you can not close, if emails are sent automatically, the reason can only be one: the system has a virus. The main...