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IBM System/360 User Manual

IBM System/360
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As3igninq
Attributes
to
a
Data
Set
TSO
data
set
characteristics
are
called
attributes.
Generally,
you
do
not
have
to
be
concerned
with
attributes
because
TSO
assigns
them
automatically.
In
some
instances,
however,
you
may
want
to
allocate
a
data
set
with
attributes
different
from
those
assigned
automatically.
The
ATTRIB
command
provides
a
way
for
you
to
do
this.
Basically,
you
use
the
ATTRIB
command
to
build
a
list
of
the
attributes
that
you
want
to
assign
to
a
data
set.
Then
you
use
the
ALLOCATE
command,
specifying
the
name
of
the
attribute
list
as
the
value
for
the
USING
(attr-list-name)
operand.
The
attributes
in
the
list
are
assigned
to
the
data
set
when
it
is
allocated.
You
can
refer
to
the
attribute
list
any
number
of
times
during
the
remainder
of
your
terminal
session.
When
you
finish
using
the
attribute
list,
you
can
use
the
FREE
command
to
delete
it
from
the
system.
The
operands
of
the
ATTRIB
command
correspond
to
data
control
block
(DCB)
parameters
discussed
in
the
following
publicati
ons:
•
IBM
~ystem/360
Operating
System:
Job
Control
Language
Reference,
GC2S-6704
•
•
IBM
System/360
O~tinq
System:
Data
Management
Services,
GC26-3746.
You
should
understand
the
purpose
of
DCB
parameters
as
presented
in
these
publications
before
using
the
ATTRIB
command.
The
example
in
Figure
7.1
illustrates
the
use
of
the
ATTRIB
command.
In
this
example,
the
attributes
are
the
logical
record
length,
the
block
size,
and
the
expiration
date.
r---------------------------------------------------~-------.
---------,
I
attr
dchparms
Irecl{24)
blksize(96)
expdt(72111)
I
I
READY
I
I
alIce
da('attr.show')
using(dcbparms)
new
bl(SO)
sp(l,l)
vol(231400)
I
I
READY
I
I
free
attrlist(dcbparms)
I
L
______________________________________________________________________
J
Figure
7.1
Assigning
Attributes
to
a
Data
Set
Freeing
an
Allocated Data Set
Use
the
FREE
command
to
release
any
data
sets
allocated
to
you.
You
can
also
use
this
command
to
change
the
output
class
of
a
SYSOUT
data
set,
or
to
release
attribute
lists
created
by
the
ATTRIB
command.
To
free
~
data
set
specify
its
data
set
name
or
its
file
name
(ddname).
If
your
terminal
has
been
allocated
as
a
data
set,
you
must
free
it
through
its
file
name.
You
can
use
the
LISTALC
command
to
obtain
the
file
names
and
data
set
names
of
the
data
sets
allocated
to
you.
(LISTALC
is
described
in
the
Section,
II
Listing
the
Names
of
Your
Data
Sets
n • )
The
following
examPle
frees
the
data
sets
allocated
in
Figure
7
of
the
section
"Allocating
a
Data
Setn.
The
output
class
of
the
SYSPUNCH
data
set
is
changed
to
B.
free
dataset
( •
sys1.maclib'
.prog
.obj"
input.asm)
file
(sysut1,-
sysut2,sysut3,sysprint,syspunch)
sysout(b)
Entering
and
Manipulating
Data
61

Table of Contents

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IBM System/360 Specifications

General IconGeneral
BrandIBM
ModelSystem/360
CategoryDesktop
LanguageEnglish

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