User`s guide

The command field must identify either a built-in command, a transient program,
or a submit file. For example, USER is the keyword that identifies the built-in com-
mand that changes the current user number. The CP/M 3 CCP displays the user
number in the system prompt when the user number is non-zero. The following
example illustrates changing the user number from zero to 15.
B>USER 15
15B>
The following table summarizes the built-in commands.
Table 1-1. CP/M 3 Built-in Commands
Command Meaning
DIR displays a list of all filenames from a disk directory except those
marked with the SYS attribute.
DIRSYS displays a filename list of those files marked with the SYS
attribute in the directory.
ERASE erases a filename from a disk directory and releases the storage
occupied by the file.
RENAME renames a file.
TYPE displays the contents of an ASCII character file at your console
output device.
USER changes from one user number to another.
Some built-in commands have associated command files which expand upon the
options provided by the built-in command. If the CCP reads a command line and
discovers the built-in command does not support the options requested in the com-
mand line,, the CCP loads the built-in function's corresponding command file to
perform the command. The DIR command is an example of this type of command.
Simple DIR commands are supported by the DIR built-in directly. More complex
requests are handled by the DIR.COM utility.
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1.6 System Operation CP/M 3 Programmer's Guide