The vipw command can only be executed by the superuser. It is a command related to user accounts. Its purpose is to use the vi editor to open and modify important configuration files for user accounts, specifically "/etc/passwd" and "/etc/shadow", in order to make changes to user account parameters. However, it's important to note that modifying these two configuration files requires a good understanding of their formats; otherwise, errors can easily occur. It is recommended to use the usermod command for safely configuring user account parameters.
For more detailed information about using the vipw command and editing the "/etc/passwd" file, you can refer to the provided link.