Which command would you use to list all files in a directory, including hidden files?

The command used to list all files in a directory, including hidden files, is "ls -a." In the context of Unix-based systems like Linux, "ls" stands for "list," and the "-a" option is used to include all files, including those that start with a dot (.), which are typically considered hidden. This option provides users with a comprehensive view of the contents of a directory, ensuring that no files are omitted from the display.

Other choices do not represent valid commands for this operation. "list all" is not a valid command in shell environments. "dir -h" is also not appropriate because while "dir" is a valid command, it typically doesn't include hidden files with that option. Lastly, "show files" is not a recognized command in the Linux command set. Thus, using "ls -a" is the correct choice for listing all files, including hidden ones, in a directory.