Which command can be used to display the current directory?

The command used to display the current directory in a Linux environment is "pwd," which stands for "print working directory." When executed in the terminal, this command reveals the absolute path of the directory that the user is currently in, providing a clear understanding of the filesystem's structure.

Understanding this command is fundamental for navigating the command line, as knowing the present working directory helps users effectively manage files and folders. The other options do not serve this purpose: "show" is not a standard command for displaying the directory, "dir" is typically used in DOS or Windows environments to list directory contents rather than showing the current directory, and "cd" is used to change the directory rather than display the current one. Thus, "pwd" is the correct tool for revealing one’s current location in the filesystem.