Control Language (CL) Concepts
Operating System/400(R) (OS/400(R)) objects provide
the means through which all data processing information is stored and
processed by OS/400. An OS/400 object is a named unit that
exists (occupies space) in storage, and on which operations are performed by
the operating system.
CL commands perform operations on the Operating System/400 objects.
Several types of OS/400 objects are created and used in the control
language.
OS/400 objects have the following in common:
- Objects have a set of descriptive attributes that are defined when the
object is created.
- Objects have to be used by the system to perform a specific function must
be specified in the CL command that performs that function.
- Objects have a set of attributes that describe it and give the specific
values assigned for those attributes.
- Generally, objects are independent of all other objects. However,
some objects must be created before other objects can be created; for
example, a logical file cannot be created if the physical file it must be
based on does not exist.
- Objects must be created before other operations that use the object are
performed. Descriptions of the create commands (those commands that
begin with the letters CRT) give more information about the object types that
they create.
- Every OS/400 object that is used by the control language has a
name. The object name specified in a CL command identifies which object
is used by the operating system to perform the function of the command.
- Objects have either a simple, qualified, or generic name.
For additional information about OS/400 objects, see the following:
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