The command 'file [file name]' is used to:

The command file [file name] is utilized to determine the type of a file based on its content rather than its extension. When executed, it analyzes the file and returns a description of its format, such as whether it is a text file, a binary executable, an image file, or other types of data. This utility is particularly valuable in Linux, where file extensions are less significant than in some other operating systems; thus, the command provides important information about the file's nature and helps users understand how to handle or process the file correctly.

By using the file command, users can gain insights into files without needing to open them, which is especially useful for programming, system administration, and anytime a user encounters unfamiliar file types.