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Section A:
General Introduction
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Filenames
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A.6. Filenames
We
already
mentioned in the general introduction that the notation
of
filenames
is
a part of the worldwide standard of EOS
and
other
CP/M
compatible operating systems. As practically all commands refer to files
in one way or the other, the time has come to talk about filenames.
A.6.l. Unambiguous Filenames
A file designation is composed of two parts, the proper filename and the
file type:
CUSTOMRS.DTA
ACCOUNTS.REC
012345
These
are
some
typical examples of file
designations,
Left
of
the
period,
the filename is specified,
and right of it, the file type, The
filename may be up to B characters long,
the file type up to three.
In
some cases, the file type may be omitted. We shall deal with them later.
With
a few exceptions,
all printable characters may be used
for
con-
structing filenames.
Control characters are not permitted,
neither are
the characters listed below:
(Equals sign}
<
(Less-than sign}
>
(Greater-than sign)
(Colon)
(Period)
, (Comma)
Space { blank
[
I
because they have a special meaning with commands.
Furthermore,
a
number
of programs require filenames beginning with
a
letter,
followed by nothing else but letters and digits.
Certain
file
types can be prescribed.
For details on these matters,
please refer to
the corresponding program descriptions,
In
the EOS command level,
all lowercase letters used in input are con-
verted to uppercase letters.
You cannot directly refer to a file
which
contains
lowercase
letters in ·its name (There are some programs
using
lowercase letters in filenames) .
EOS User's manual
Daeumling & Zimmermann
Page
2~
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