Like other programming languages, bash provides you with the option to ignore a single line, inline, or a block of lines from execution.

The shell is nothing more than a program that carries the user typed commands or instructions from the terminal to the kernel.

In this article, you will learn what utmp, wtmp, and btmp log files are, their purpose, and how to read them using the built-in command tool in Linux.

In the Linux world, two common commands, “ls” and “dir“, replicate each other so well that most Linux users think one of them is an alias or symbolic link to the other.

Discover the lightweight yet powerful open-source Geany text editor alternative to Notepad++ on Linux with an installation guide and a few tips and tricks.

The grep command is used to perform regular expressions to find out strings and patterns from the file that match a regular expression.

In Linux, we have a root user created by the system administrator and normal users, which are also created by the system administrator.

Symbolic links, sometimes also referred to as "symlinks," are used to create file pointers pointing towards files and directories in the Linux system.

It is important for a Linux administrator to find out all the users in their current system so that they can adjust the rules and privileges for each one.

In Linux, stdin, stdout, and stderr streams are already part of your Linux system and attached to your terminal device to inspect the data.

The “/dev/null” file is a special file that can be found in all Linux systems. They are also referred to as “null device files,” “void,” and sometimes “a black hole of Linux”.

The echo command takes the text or file as an argument and prints the output on the screen. It is mostly used in shell scripts to instruct the user or give any piece of information.

The PWD (a.k.a. "present working directory") will print the path of the directory you are currently working in, starting from the root directory to the current directory.

The groups command is used to list all the groups to which the specified user belongs. This will make it easier for you to manage users and groups in your system.

The which command locates the executable command or file location in the user’s environmental path. It will give you the complete path an executable command or file is pointing towards in your file system.

The find command is an advanced tool for searching files or directories rigorously in your file system, taking a little longer time than its alternative tools like the locate command.

The environment variables are a set of key-value pairs that define the current environment and can affect the behavior of the ongoing programs that are executed in the environment.

The source is a built-in command-line tool that reads and executes the commands from the specified file as its argument in the current shell.

To avoid jumping into the directory to execute your local program or script, you can add their paths to the $PATH variable to access them from anywhere.

The WC command is used to count various parameters from the specified file, like the number of lines, word counts, byte counts, character counts, and many more.

In this article, you will learn to count the number of string occurrences in a text file using the grep, wc, and tr commands, including the VIM text editor.