IBM 5150 Manual To Operations page 118

For You to Try
Insert your DOS Diskette in drive A: and type this:
dir *.com
and press the Enter key.
Now try this:
dir ????????com
and press the Enter key.
Type this:
dir c*.com
and press the Enter key. Did you see three files listed?
An Exercise: Listing the DOS Diskette Files
Here's something for you to do right now-use the
DIR
command to find out the names of the files on the DOS
Diskette.
This exercise also teaches you how to print a directory
listing. If you don't have a printer, do the parts you can,
and read along for the rest.
Before You Begin
Find your DOS Diskette, and make sure that your
printer is on, is on-line, and has paper in it.
DOS 3-44