DIGITAL RESEARCH(r) CP/M Plus TM (CP/M Version 3) Operating ...

CP/M 3 User's Guide 5.2 How Commands Are Described
Let's look at some examples of syntax notation. The CP/M 3 DIR (DIRectory)
command displays the names of files cataloged in the disk directory and, optionally,
displays other information about the files.
The syntax of the DIR command with options shows how to use the command
line syntax notation:
Syntax: DIR{fd:{|}filespec}{[options]}
| | |
optional optional optional
This tells you that the command tail following the command keyword DIR is optional.
DIR alone is a valid command, but you can include a file specification, or a drive
specification, or 'ust the options in the command line. Therefore,
DIR
DIR filespec
DIR d:
DIR [RO]
are valid commands. Furthermore, the drive or file specification can be followed by
another optional value selected from one of the following list of DIR options:
RO
RW
DIR
SYS
Therefore,
DIR d:filespec [RO]
is a valid command.
Recall that in Section 2 you learned about wildcards in filenames and filetypes.
The DIR command accepts wildcards in the file specification,
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