Which command can be used to display the current working directory?

The command that displays the current working directory is indeed "pwd." This stands for "print working directory." When executed, it provides the full path to the directory you are currently in within the filesystem. This is particularly useful for navigation and scripting, as it allows users to confirm their location in the directory structure before executing further commands that depend on the current directory.

The other options serve different purposes: "cd" is used to change directories; "ls" lists files and directories in the current directory; and "showdir" is not a standard Linux command. Therefore, "pwd" stands out as the appropriate choice for displaying the current working directory.