In a bash shell, what does the command `alias ll='ls -l'` accomplish?

The command alias ll='ls -l' establishes a shorthand or shortcut in the bash shell for an existing command. When you type ll, it will execute the command ls -l, which lists directory contents in a detailed format, showing file permissions, ownership, size, and modification date for each item.

This command primarily serves the purpose of enhancing efficiency and convenience. Instead of typing the longer command ls -l each time you want to list files with detailed information, you can simply type ll.

The other options suggest related functionalities but do not accurately describe the primary function of the alias command. For instance, while ls -l does indeed list files with detailed information, the alias specifically creates a shortcut for entering that command in a more user-friendly way, rather than solely being about viewing directory contents. Additionally, it does not set a permanent configuration unless specified in a configuration file like .bashrc, nor does it involve opening a new shell environment.