Which command is used to display the contents of a text file?

The command used to display the contents of a text file in a Linux environment is 'cat'. This command stands for "concatenate" and is primarily used to read and output the contents of files directly to the standard output (usually the terminal). When you run 'cat' followed by the name of a file, the command will print the entire contents of that file line-by-line, allowing you to easily view its contents.

For instance, executing 'cat example.txt' would show the text within 'example.txt' directly in the terminal window. This utility is versatile and can not only display single files but can also concatenate multiple files and output them to the terminal or another file if needed. This makes it an essential command for quick file viewing and manipulation in Unix-like systems.

The other options do not provide the same functionality or might refer to different tools or commands that aren't standard for viewing files in this way.