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

4.2 Built-in Commands CP/M 3 User's Guide
If you include certain options in the command tall for a built-in command,
CP/M 3 might return a .C0M Required message, This means that the command
tail options require support from a related transient utility and CP/M 3 could not
find that program file. The following files must be accessible to support all the
functions these built-ins offer: ERASE.COM, RENAME.COM, TYPE.COM, and
DIR.COM.
Section 5 explains in detail the built-in commands listed in Table 4-1.
Table 4-1. Built-in Commands
Command Function
DIR Displays filenames of all files in the directory except those marked
with the SYS attribute.
DIRSYS Displays filenames of files marked with the SYS (system) attribute
in the directory.
ERASE Erases a filename from the disk directory and releases the storage
space occupied by the file.
RENAME Renames a disk file.
TYPE Displays contents of an ASCII (TEXT) file at your screen.
USER Changes to a different user number.
CP/M 3 allows you to abbreviate the built-in commands as follows:
DIRSYS DIRS
ERASE ERA
RENAME REN
TYPE TYP
USER USE
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