3.2 ERA - Erase File(s)
The ERA command is the CPIM Function which allows you to erase a file, It can be used at any tIme that the system prompt IS displayed on the screen.
Unless told otherwise CPIM assumes that you require te erase a file on the Logged Drive,
For example, to erase the file TRIAL,TXT on drive B: yeu should key:
A>ERA B:TRIAL.TXT<CR>
A>
Note the space after the ERA and the colon after the drive letter_
There is no response If the file is erased except that the system prompt is returned for your next instruction.
If the file specified is not present on the drive specified CPIM will report an error as follows:
A>ERA B:TRIAL.TXT<CR>
Fi le not found: TRIAL. TXT A>
To swnmarise: to erase a file, specify the drive name if not the logged drive, and the file name, Remember the space after ERA, the colon after the drive name and the confirmatory <CR>.
Files can also be erased as groups with some common letters or numbers in the file name descnption or type. CP/Ms two wild characters; the .. and the? are used.
Remember, ? represents any single character ... can represent a single character, or a number of characters,
CP/M BUILT IN COMMANDS
To erase only those files on Drive A: with four characters and only four characters in the filename use the following command:
A>ERA ????<CR>
To erase all the files on Drive B: key:
A>ERA B:*.*<CR>
In response to this request. CPIM
will
present a cautionury option Confirm delete alluser files
(YIN)? This prompt requires a response of y for yes orn
for no.3.3 REN - Rename File(s)
REN is the CP/M Function which renames a file or your choice. REN can be used at any time when the system prompt is displayed.
Unless otherwise instructed CPIM assumes that you require to rename a file on the Logged Drive.
To rename the file WORKI to
a
new name MANUAL. TXT enter the command as followsA>REN MANUAL.TXT=WORK1<CR>
Note the space after REN and the confirmatory <CR>. If the file WORKI had been on drive B: then the drive specification B: would be inserted prior to the new file name thus B:MAN11AL.TXT. Both ille names (old and new) are Obvlously on the same drive.
There is no system response when the file is renamed. (Run DIR to confirm).
1£
a file with the new name exists on the drive designated. CP/M wlll report File Exists. If CPIM cannot find a file with the old name on the drive specified it will report File not found.57
CP/M BUILT IN COMMANDS
It is important to remember with the rename conunand that the new name is staled before the old name. This sequence will help you remember.
What is the current logged drive?
On which drive is the file to be renamed?
What is the new file name?
What is the old file name?
3.4 TYPE -Display a File
The command TYPE will display the contents of a text file on screen or on the printer.
For example to display the file TEST,DAT (which is on drive B:) on the terminal screen the command line is:
A>TYPE B:TEST.DAT<CR>
To output the flle to the printer the command line would be:
A>TYPE B:TEST.DAT<tP)<CR>
Where
< T
P> means hold the CTRL key down and simultaneously press the P key. When the function is complete the< t
P> must be repeated to switch off the output to the printer.CP/M will assume the logged drive unless instructed otherwise.
The display of the file can be arrested and restarted at any time by keying
< T
S>to freeze the display and
< T
Q> to restart it.If the file requested is not present on the'stated drive, a file not found message is
CP/M BUILT IN COMMANDS
3.5 USER -
Define aUser
AreaThe disk space available to users under CPI11. may be divided into separate user areas. Each area will contain files belonging to the designated user. CP/M allows up to sixteen user areas to be defined. The standard default user area is User O. If you are the only user of your system then all your files can quite happily reside in the default user 0 area.
However, If you have a Winchester disk system you may find user areas useful to group together files reiating to different tasks. For example. you may choose to assign user I for word processing files and user 2 for spreadsheet operations. An otherwise unassigned user area is also very useful for copying the contents of a floppy disk onto another floppy disk via the Winchester. (See under PIP for details).
Files in any of the defined user areas (I-IS) can only be accessed by an operator ill
that user area. They will not show up on another user's directory for example.
A user area can be opened at any time that the system prompt is displayed thus:
A>USER 1<CR>
1A>
Note the 1 preceding the A which shows the current user number. For user area 0 (the default user number) this position in the system prompt is blank
The user number must be in the range 0 to IS inclusive.
DlR. ERA. REN and TYPE when used withLf'l a defined user area will only operate on files wi:hin that user area.
However, files described as System Files in USER area 0
can
be accessed by all users.PIP can be used to copy files between user areas.
Use the command:
A>SHOW [USERS]<CR>
to obtain a list of users and the numbers of files wilhin each user area.
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