The Cp/M Built-In Commands - Epson PX-8 User Manual

3.7 The CP/M Built-In Commands
Built-in commands are commands which can be executed simply by typing in
their name on the command line. They do not show up as files on the directory
(as do STAT and PIP, for example) but are part of CP/M itself. They are:
DIR
ERA
REN
SAVE
TYPE
USER
Display a list of files on a particular disk.
Erase a specified file or files.
Rename a specified file.
Save a portion of memory as a file.
Display the contents of a file on the screen.
Assign files to different users
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3.7.1
D IR
(Directory)
This command is used to display a list of file names stored on a disk. There
are various ways of specifying the files depending on the results you want. These
are achieved using wildcards (section 3.2.1). On a conventional CP/M com-
puter the CP/M operating system is loaded into the computer from disk.
It
is not displayed on the directory.
It
is also possible to make other files non-
directory files. This can be done in two ways. Files can be set (and reset) to
'SYS' files using the STAT program. These files do not appear on the directo-
ry
of any user. Files can also be assigned to different users using the USER
command, and then only appear on the directory when the particular user to
which they belong is using the disk.
Points worth bearing in mind when using the DIR command are:
• There must be a space between DIR and the filename (if there is one).
• No space must be put between the drive name and filename if this is used.
• The files are not sorted into alphabetical order, and are usually displayed
in the order in which they were first put on to the disk.
If
you require
an alphabetical list it i~ best to use the STAT command.
a) List all files on the currently logged-in drive
The simplest way to do this is to type DIR on the command line:
C>DIR
C : PIP COM: STAT COM: SUBMIT COM: XSUB COM
C : CONFIG COM: FlUNK COM: TERM COM
The same result can be obtained by being more long-winded and using the drive-
name or wildcards:
C>DIR C:
C > DIR C:????????
*
b) List all the files on a drive
oth~r
than that currently logged in
This can be done simply by adding the required drivename to the command:
C>DIR A:
A: PIP
COM
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