Which command allows you to list all files in a directory in Linux?

The command that allows you to list all files in a directory in Linux is "ls." This command is widely used in Unix and Linux environments and is fundamental for interacting with the file system. When executed, "ls" displays a list of the files and directories contained within the specified directory, and it can also take various options to modify its output, such as showing detailed information about the files (using the "-l" option) or displaying hidden files (using the "-a" option). The versatility and prevalence of the "ls" command make it central to file management in the Linux command line.

Other options do not serve the purpose of listing files in a Linux environment. For example, "dir" is often associated with DOS and Windows systems, while "list" and "show" are not standard commands in Linux for this function. Thus, "ls" is the appropriate command for listing files in a directory in Linux.