Commodore 128 Programmer's Reference Manual page 490

480 COMMODORE 128
USER NUMBER -
CP/M 3.0 further identifies all files by assigning each one a user number, which can i i
range from 0 to 15. CP/M 3.0 assigns the user number to a file when the file is created.
User numbers allow you to separate your files into sixteen file groups.
Any user number other than 0 must precede the drive specifier. User 0, which is
the default user number, is not displayed in the prompt. I
If a file resides in user 0 and is marked with a system file attribute, that file can Lj
be accessed from any user number. Otherwise, a command can access only those files
that have the current user number. [ >
CREATING A FILE "
There are several ways to create a CP/M file, including: I i
■ Using the CP/M text editor (ED). ^
■ Using the PIP command to copy and rename a file.
■ Using a program such as MAC (a CP/M machine language assembler program), I I
which creates output files as it processes input files. LJ
USING WILDCARD CHARACTERS TO
ACCESS MORE THAN ONE FILE Li
A wildcard is a character that can be used in a filename or filetype in place of some other
characters. CP/M 3.0 uses the question mark (?) and asterisk (*) as wildcards. A ? stands | I
for any character that may be encountered in that position. An * tells CP/M to fill the M
filename with question mark characters as indicated. A file specification containing a wild
card can refer to more than one file and is therefore called an ambiguous file specification.
RESERVED CHARACTERS -
The characters in Table 14—1 are reserved characters in CP/M 3.0. Use only as indicated.
CHARACTER MEANING L-
<$,!!>[] ] , ,
TAB, SPACE, I File specification delimiters
CARRIAGE RETURN] U
: Drive delimiter in file specification
Filetype delimiter in file specification
; Password delimiter in file specification
; Comment delimiter at the beginning of a command line U
* ? Wildcard characters in an ambiguous file specification
< > & ! I \ + - Option list delimiters ,
[ ] Option list delimiters for global and local options j
() Delimiters for multiple modifiers inside square Lj
brackets for options that have modifiers
/ $ Option delimiters in a command line I i
Table 14-1. CP/M 3.0 Reserved Characters LJ