What is the purpose of the 'alias' command in Bash?

The 'alias' command in Bash is used to create a shortcut for commands, allowing users to define a new name or abbreviation for a longer command. This helps enhance productivity by reducing the amount of typing needed for frequently used commands or complex command-line options. For instance, instead of typing 'ls -la' every time to list all files in a detailed format, a user can create an alias such as 'll' which simplifies and speeds up the process. This functionality is especially beneficial for users who regularly execute the same commands, as it streamlines their workflow and makes command-line usage more efficient.

In contrast, options related to creating backup files, renaming variables, or removing files describe separate functions that do not pertain to the purpose of the 'alias' command. Each of those actions has its own specific command or approach in the Bash shell, underscoring the unique role of 'alias' in enhancing command-line usability.