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tags: Linux commands, tail command, file monitoring, log files, UNIX environment The tail command is a powerful tool in Linux that allows you to monitor file changes. One of its best use cases is when it is called with the -f option, which opens a file at the end and continuously displays any new content added to the file. This feature is particularly useful for monitoring log files. To utilize this feature, simply run the following command:...

In the vast world of networking, the ping command is a valuable tool that can help you assess the reachability and connectivity of a network host. Whether you are troubleshooting network issues or simply wanting to test the response time of a server, ping comes to the rescue. Using the ping command is straightforward. You simply enter ping <host> in the terminal, where <host> can be either a domain name or an IP address....

In this blog post, we will explore the touch command, which is used to create an empty file in a Linux environment. Whether you are using Linux, macOS, WSL, or any UNIX-based system, the touch command is an essential tool in your command line arsenal. To create an empty file using the touch command, simply open a terminal and enter the following command: touch filename Replace “filename” with the desired name of your new file....

A comprehensive guide to the umask command, its functionality, and how to effectively set default file permissions. When creating a file, it is not always necessary to specify permissions right away, as default permissions are assigned. These default permissions can be controlled and modified using the umask command. To check the current umask value, simply type umask without any arguments. The command will display the current umask value, such as 0022....

In the world of Linux commands, the type command plays a crucial role in determining the nature of a command. It helps identify whether a command is an executable, a shell built-in program, a shell function, or an alias. Let’s explore each of these types: Executable: An executable refers to a standalone program that can be executed directly. Shell Built-in Program: These are commands that are built into the shell itself....

In the Linux operating system, the sudo command is commonly used to run a command as another user, most notably as the root user. This allows for the execution of privileged operations that require administrative permissions. To use sudo, you must have it enabled on your system. Once enabled, you can run commands as root by entering your user’s password (not the root user password). This provides an extra layer of security....

In this blog, we will explore the wc command, which is used to count lines, words, or bytes in a file or input received via pipes. The wc command provides us with valuable information about a file or data stream. To illustrate its usage, let’s consider an example. Suppose we have a file called test.txt. We can use the wc command to count the number of lines, words, and bytes in this file by running the following command:...

In this guide, we will explore the whoami command, which is used to print the current user name. This command works on Linux, macOS, WSL, and any UNIX environment. How to Use the whoami Command To print the user name currently logged in to the terminal session, simply type whoami and press Enter. Here’s an example: $ whoami john_doe Note: The whoami command should not be confused with the who am i command, which provides more detailed information....

Today, I’m going to give you a quick guide on how to use the which command in Linux. The which command is very useful when you want to locate the path of a specific command. Let’s say you have a command that you can execute in the shell because it’s in the shell path, but you’re curious about its location. In this case, you can use the which command to find out where it is stored....

Recently, I encountered a perplexing issue on my Linux Ubuntu server. To investigate the problem, I accessed the server and checked the Apache error log located in /var/apache2/error.log. To my dismay, the log was inundated with numerous instances of the dreaded “No space left on device” error. Apprehension set in as I pondered how this could have happened. To get a better understanding of the situation, I decided to run the df command, which confirmed my suspicions - the disk was completely full....