Radio Shack TRS-80 model III Owner's Manual page 42

TRSDOS
J
COPY /BASsO
5i
tells
trsdos
to
copy
all
Drive
files
which have
the
extension /bas.
The
files
will
be copied onto Drive
1
,
using
their
present
file
names and
extensions.
Sample Use
Whenever
a
file is
updated, use
copy
to
make
a
backup
file
on another disk.
You
can also
use
copy
to
restructure a
file
for faster access.
Be
sure the destination
disk
is
already
less
segmented
than the
source disk;
otherwise the
new
file
could
be
more segmented than the old
one. (See
free
for
information
on
file
segmentation.)
To rename
a
file
on
the
same
disk,
use
rename,
not copy.
CREATE
Create a Pre-allocated File
te^
If
omitted,
tm
is
as^iini#.
f
;
refc&rdstlosired;
it
omitted,
no records are
al|o0pC
:
This
command
lets
you
create a
file
and pre-allocate
(set
aside)
space for
its
future contents.
This
is
different
from the default
(normal)
trsdos
procedure
in
which
space
is
allocated
to
a
file
dynamically,
i.e.,
as
necessary
when
data
is
written into the
file.
If
you open
the
file
for
sequential
writes,
trsdos
will
de-allocate (recover)
any
unused granules
when
the
file is
closed.
If
you open
the
file
for
random
access,
trsdos
will
not de-allocate space
when
the
file is
closed.
35