ATM Configuration and Management Manual

SCF Commands
ATM Configuration and Management Manual—522307-003
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How SCF Works
Several commands are available for displaying and changing SCF session parameters.
For example, the SYSTEM and VOLUME commands control the default system,
volume, and subvolume names used for expanding file names. The OBEY and OUT
commands control the files used for command input and display output. The ASSUME
command defines a default object to be used when the object is omitted from an SCF
command.
You can use the HELP command in several ways. In its basic form, it displays a list of
the available SCF commands. You also can 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 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 in conjunction with the security features of the operating system, SCF
provides effective access control for sensitive commands. Commands that request
information or status but do not affect operation are called nonsensitive commands.
Nonsensitive commands are available to all users. For more information on sensitive
and sensitive commands, see the SCF Reference Manual for G-Series RVUs .
How SCF Works
For commands that relate only to SCF (rather than a subsystem), SCF takes
appropriate action without involving the subsystem product modules or SCP. For
commands that relate to a subsystem or its objects, SCF performs syntax checking
and validates the object specification. Then SCF forwards the command to the
subsystem product module for the specified object. From there, the subsystem product
module validates the command again and translates it into a formatted message for
SCP, which then communicates with the appropriate subsystem to perform the
specified task.
SCF accepts commands from a workstation, a disk file, or an application process. It
sends display output to a workstation, a file, a process, or a printer.
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If you start SCF interactively, the TACL RUN command specifies the input source
and output destination.
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If you start SCF by using a process creation system procedure, the start-up
message specifies the input source and output destination. Subsequent SCF
commands can change the input source and output destination.