Which of the following commands would give you a list of all files and directories in the current directory?

The command that provides a list of all files and directories in the current directory is "ls." This command is a fundamental and widely used utility in Unix and Linux environments for directory listing. When executed without any options, "ls" displays the names of the files and directories in the current working directory, making it a go-to command for users who need to view the contents of a directory quickly.

Additionally, "ls" can take various options to modify its output—for example, using "-l" for a long listing format or "-a" to include hidden files—but when used in its simplest form, it effectively meets the requirement stated in the question.

The other commands listed are not standard or common for listing directory contents in Unix/Linux environments. "dir," while it does list directory contents, is more commonly associated with DOS or Windows command-line interfaces rather than Linux. "list" and "show" do not correspond to recognized commands in Unix/Linux for listing files and directories. Thus, "ls" stands out as the appropriate command for this task.