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For Developers, Designers, and Makers.
The Guides section is designed for sharing useful tidbits and guides in categories such as web development, server management and general DevOps. It is also used as a place to share individual tips that are later bundled into resources (e.g. the 10 most common JavaScript errors). We've also designed these guides with a dark-mode on design by default.
The Cannot read property '<property>' of undefined error is thrown when you try to access a property of an undefined value. This typically happens when you try to access a property of a variable that hasn't been assigned a value. A few other common scenarios include: In general, this error occurs when you are trying […]
Zip and unzip are two commonly used commands in Linux for compressing and archiving files. This tutorial will show you how to use these commands to manage your files. Some common uses for zip files include: How to Install zip & unzip For Debian-based systems, such as Ubuntu: For CentOS and Fedora: If you are […]
In Linux, the .bashrc file is a hidden file in your home directory that contains settings and configurations specific to the Bash shell. It is executed whenever you start a new Bash shell and can be used to set environment variables, define aliases, and customize your shell environment. The .bashrc file is a convenient place […]
In this article, we will look at how to use the netstat, ss, and lsof commands to check which ports are open and listening on a Linux system. These commands can be useful for network administrators who need to identify potential security vulnerabilities or troubleshoot network connectivity issues. We will also look at examples of […]
Linux includes a variety of tools for searching for files, and two of the most commonly used are the find and locate commands. The find command is a powerful tool that allows users to search for files based on a wide range of criteria, such as the file's name, size, ownership, and permissions. find also […]
In Linux, it is important to change file permissions and ownership for security reasons. File permissions determine who can read, write, and execute a file, and ownership determines who has the right to change the file. By changing these settings, you can control which users can access a file and what they can do with […]
How to Change the User Password To change the password for the currently logged-in user, you can use the passwd command. Some important things to keep in mind when changing a user's password: Important Using this method without specifying a user will always change the password for the current user. So, if you do this […]
How to Remove a Directory in Linux To remove a directory in Linux, use the rm command with the -r option for recursive removal. For example, to remove a directory named mydir, you would use the following command: This will remove the directory and any files or subdirectories it contains. Be careful with this command, […]
How to Rename a Single File To rename a file in Linux, you can use the mv command. This command allows you to move a file from one location to another and can also be used to rename a file. Here's an example of how to use the mv command to rename a file: In […]
The "Uncaught SyntaxError: Unexpected identifier" error is a syntax error that occurs when the JavaScript interpreter encounters an unexpected identifier (i.e., a variable or function name) in the code. This error typically indicates that there is a syntax mistake in the code that is preventing the interpreter from parsing it correctly. For example, if you're […]
The "Unexpected end of JSON input" error is a syntax error that occurs when the JSON you're trying to parse is incomplete or invalid. This error typically occurs when you're trying to parse JSON using the JSON.parse() method, and the JSON string you're passing to it is either incomplete or invalid. For example, if you're […]
The "TypeError: forEach is not a function" error is thrown when the code attempts to call the forEach() method on a value that is not an array or an array-like object. The forEach() method is a method that is defined on the Array.prototype, so it can only be called on an array or an object […]