8.8 Filename and Path Completion
Rather than typing in an entire file name or path, or using pattern matching to reduce the amount of typing, the shell provides the filename completion feature. In order to use filename completion, simply enter the first few characters of the file or path name and then press the Esc key twice. The shell will then complete the filename for you with the first file or path name in the directory that matches the characters you entered. To obtain a list of possible matches, press Esc = after entering the first few characters.