Managing user permissions in an operating system is essential for controlling what each user account can do on the system, such as accessing, modifying, or executing certain files, folders, or applications. Generally, user permissions are based on the account type of the user, but they can also be customized. To do this, you must log in to the system as an administrator or root user and open the file manager or explorer of the operating system. Then locate the file, folder, or application that you want to change the user permissions for and right-click on it to open its properties. Select the security or permissions tab and view or edit the user permissions for that item. Once you confirm and save your changes, make sure to log out of the administrator or root account. Additionally, some operating systems allow managing user permissions using command-line tools or commands. For example, to grant full control to a user account named Alice for a file named report.docx in Windows, you can use the command icacls report.docx /grant Alice:F .