Which command in Linux is used to list all files in a directory?

The command used in Linux to list all files in a directory is 'ls'. This command provides a quick overview of the files and directories contained within the current working directory or a specified directory. It's essential for users to navigate and manage files within the Linux file system efficiently.

The 'ls' command can also be combined with various options or flags to enhance its functionality, such as displaying detailed information about each file or showing hidden files. For instance, using 'ls -l' provides a long listing format that includes file permissions, owner, size, and modification date.

In contrast to 'ls', other options like 'dir' is a command used primarily in DOS and Windows environments to list directory contents, while 'list' and 'show' are not standard commands found in Linux for this purpose. Thus, 'ls' is the appropriate and widely recognized command for listing files in Linux.