SNAX/XF and SNAX/APN Configuration and Management Manual

Introduction to SCF for SNAX/XF and SNAX/APN
SNAX/XF and SNAX/APN Configuration and Management Manual—425836-006
11-10
Running SCF
The SCF Reference Manual for G-series RVUs describes how to run SCF. SCF
performs most commands in the following sequence:
1. When SCF receives a command, it interprets the command and performs the steps
necessary to execute it. Some commands can be handled by SCF with no
interaction with SCP (for example, OUT).
2. If the command involves control or configuration of a subsystem object or a
request for information about an object, SCF produces a message that describes
the object and the operation to be performed on it. This message is then sent to a
subsystem I/O process or a subsystem manager process through SCP. A single
command might require several messages before the operation can be completed;
the exact number of steps required to execute a command varies from command
to command.
3. When the subsystem I/O process or a subsystem manager process has processed
the message, it returns a completion message (one or more messages, if the
command is a request for information about an object) to SCF through SCP. SCF
displays the requested information, if any, and then displays its prompt and waits
for the next command. If the completion message indicates an error condition, SCF
displays an appropriate message and then displays its prompt.
Running SCF
SCF resides in a file called $SYSTEM.SYSTEM.SCF. To start SCF, use the TACL RUN
command. SCF can be run in either of two modes: interactive or noninteractive. For
more information about the syntax of the RUN command and these two modes of
operation, see the SCF Reference Manual for G-series RVUs.
Input Sources and Output Destinations
SCF accepts command input from a terminal or a disk file; it directs output to a disk
file, an application process, a terminal, or a printer. The initial input source and output
destination are determined by the RUN command used to initiate SCF.
At any time during an SCF session, both the source and the destination can be
temporarily changed. For information about how to set the initial input source and
output destination, and how to change them, see the SCF Reference Manual for G-
series RVUs.
Online Help
SCF provides online support when you use the HELP command, which is described in
the SCF Reference Manual for G-series RVUs. If you enter the HELP command, SCF
responds with a menu that guides you through the available help options: simply select
from the options displayed in the menu for the information you need.