QIO Configuration and Management Manual

QIO Subsystem SCF Commands
QIO Configuration and Management Manual—424717-008
4-3
Objects
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The SYSTEM and VOLUME commands control the default system, volume, and
subvolume names used for expanding file names.
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The OBEY and OUT commands control the files used for command input and
display output.
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The ASSUME command defines a default object to be used when the object is
omitted from an SCF command.

The ENV command displays the current settings of the SCF command parameters
that establish the program environment.
The HELP command can be used in several different ways. In its basic form, it displays
a list of the available SCF commands. You can also request additional specific
information, such as command syntax, for each command. For most subsystems, you
can also request subsystem-specific information for their commands.
The HELP key is also available, as it is in TACL, to display command syntax.
The RUN command allows you to run another program during an SCF session.
Because some commands can have detrimental effects if improperly used, special
qualification is required to use them. These commands are called sensitive commands.
When used with the security features of the NonStop OS, SCF provides effective
access control for sensitive commands. Commands that request information or status
but that do not affect operation are called nonsensitive commands. Nonsensitive
commands are available to all users. Sensitive and nonsensitive commands in the QIO
subsystem are described in more detail later in this section.
Objects
SCF controls a wide variety of data communications subsystems, the individual
components of which are called objects. Each object has an object type and an object
name. The object name uniquely identifies an object within the system. The objects
relevant to this subsystem are described later in this manual. For more information
about objects and other subsystems, see Where to Get More Information
on page vii.
States
Objects can have operational states, such as STOPPED or STARTED. The exact
sequence of states an object goes through varies from object to object and from
subsystem to subsystem. Some subsystem commands recognize only a few states.
The operational state of an object at a given instant is important. For example, certain
commands have no effect on an object when that object is in some specific state but
can affect the object when it is in another state.
How SCF Works
For commands that relate only to the SCF session (such as VOLUME), SCF takes the
appropriate action without communicating with SCP. For commands that relate to a