What does the 'rm' command do in a command line environment?

The 'rm' command is used to remove files or directories in a command line environment, making it an essential tool for file management. When executed, it deletes the specified file(s) from the filesystem. This action cannot be easily undone, so caution is advised when using it, especially with options that allow for the removal of directories and their contents.

In contrast, the other options refer to different commands or functionalities that do not align with the 'rm' command. For instance, running a program is typically done with commands like 'run' or simply by typing the program's name, while renaming a file is done through the 'mv' command. Reading a file is commonly performed with commands like 'cat' or 'more' but not 'rm'. Hence, 'rm' is specifically recognized for its role in file deletion.