The _dir utility displays a directory listing of the directory_name directory. If directory_name is omitted, the listing of the current directory is displayed.
The listing will show file name, file type, key size, number of records, and record size. The actual information displayed depends on the file type of the file being displayed. For example, program files have a type of "Pgm"; a key size that is the size of the entire file. The rest will be the first line of the program file.