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BB-JR93N-BB_1990
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10,7/system/zero.hlp
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ZERO Command
Function
The ZERO command clears the directory in the specified file
structure. ZERO deletes all the files in the specified
directory. The files cannot be recovered.
This command runs the COMPIL program, which interprets the
command before running the PIP program.
Format
ZERO dev:[directory]
Where: dev: is a DECtape or a disk. This argument is
required.
[directory] is a directory you have access to, if you
specify a disk structure. If you do not specify a
directory, your directory is assumed.
Characteristics
Leaves your terminal at monitor level.
Destroys your core image.
Examples
1. Delete the files on DECtape 4.
.ZERO DTA4:<RET>
.
2. Delete all files in your search list.
.ZERO DSK:<RET>
.
3. Delete all files in your SFD named CBDDT.
.ZERO DSKB:[27,4072,CBDDT]<RET>
.
APPENDIX A
FUNCTIONAL GROUPS OF COMMANDS
FUNCTIONAL GROUPS OF COMMANDS
Table A-1 lists the operating system commands, divided into groups by
function. The commands in each group are arranged in alphabetical
order. Each command is accompanied by a short description of its
function.
For an explanation of each functional group, read Sections 2.1.1
through 2.1.10.
NOTE
Table A-1 lists the commands that are described in
Section 2.2. Do not use the commands and programs
listed in Table A-1 until you are familiar with them.
Table A-1: Functional Groups of Commands
Table A-1: Functional Groups of Commands
______________________________________________________________________
Command Functional Description
Command Functional Description
______________________________________________________________________
Job-Control Group
Job-Control Group
ATTACH Connects your terminal to a previously DETACHed
job.
CONTEXT Allows you to create, delete, and switch between
contexts.
DETACH Releases your terminal from the current job.
DISABLE Disables the privileges that you previously
ENABLEd.
ENABLE Enables privileges that are assigned to your
job.
KJOB Terminates your job.
LOGIN Allows you to access the system.
PASSWORD Allows you to change your password.
POP Destroys an inferior context.
PUSH Creates an inferior context.
REATTACH Transfers your job from one terminal to another.
SESSION Changes the account string of your job.
Information Group
Information Group
ACCOUNT Prints the account string for your job.
CONTEXT Displays the status of a context.
CORE Prints the amount of core memory assigned to
your job.
CPUNCH Prints a list of the jobs in the card-punch
queue.
DAYTIME Prints the date and time.
DIRECTORY Prints a list of all the files in your
directory.
DSK Prints the disk-usage information for your job.
HELP Prints a message which shows the formats of the
HELP command.
INITIA Prints information about the system, your job,
and your terminal.
LOCATE Prints the node to which your terminal is
logically connected.
NETWORK Prints a list of the nodes in the network to
which your terminal is logically connected.
NODE Prints information about the node to which your
terminal is connected.
PJOB Prints information about the specified job.
PLOT Prints a list of the jobs in the plotter queue.
PRINT Prints a list of the jobs in the line-printer
queue.
PUNCH Prints a list of the jobs in the default punch
queue.
QUEUE Prints a list of all the jobs in all the queues.
RESOURCES Prints a list of all available devices and file
structures.
SCHEDULE Prints the system status for timesharing and
operator coverage.
SET WATCH Sets the system to automatically print
incremental job statistics.
SHOW ALLOCATION Prints the resources that are allocated to your
job, and the structures and tape volumes that
are mounted for your job.
SHOW QUEUES Prints queue requests in each queue.
SYSTAT Prints all available information about the
system; in particular, every job on the system.
TIME Prints the runtime since you logged-in and since
the last TIME command.
TPUNCH Prints a list of all the jobs in the
paper-tape-punch queue.
CTRL/T Prints the status of your job.
(USESTAT)
VERSION Prints the version number of the program
currently in memory.
WHERE Prints the node to which the specified device is
connected.
Terminal-Control Group
Terminal-Control Group
SET TERMINAL Sets the specified parameters for your terminal.
TERMINAL
SET TTY
TTY
INITIA
Terminal Communication Group
Terminal Communication Group
MAIL Sends, receives, and organizes messages to and
from other users.
PLEASE Allows communication with the computer operator.
SEND Sends a message to a specified terminal.
File-Handling Group
File-Handling Group
CLOSE Closes the open files on a device.
COPY Copies files on the same device or from device
to device.
CPUNCH Enters files in the card-punch queue.
DELETE Removes the specified file from your directory.
DIRECTORY Prints a list of the files in your directory.
EOF Writes an end-of-file mark on magnetic tape.
FILE Transfers files from disk to DECtape and DECtape
to disk.
LIST Prints a file on the line printer.
MAKE Creates a file with the text editor TECO.
PLOT Enters files in the plotter queue.
PRESERVE Changes the protection code of the specified
file.
PRINT Enters files in the line-printer queue.
PROTECT Changes the protection code of the specified
file.
PUNCH Enters files in the default punch queue.
QUEUE Enters files into the specified queue.
RENAME Changes the name of a file.
SET DEFAULT Changes your default protection code.
PROTECTION
SUBMIT Enters files in the batch input queue.
TECO Calls the TECO text editor to edit an existing
file.
TPUNCH Enters files in the paper tape punch queue.
TYPE Prints the contents of the specified file on
your terminal.
ZERO Eliminates the specified directory from the
specified device.
Device-Handling Group
Device-Handling Group
ALLOCATE Allocates resources to your job for future
mounting.
ASSIGN Allocates an I/O device to your job and assigns
logical names to the devices.
BACKSPACE Spaces a magnetic tape backward a specified
number of files or records.
CANCEL Kills queue requests.
CLOSE Closes the open files on a device.
CPUNCH Enters files in the card-punch queue.
DEALLOCATE Removes resources from your job's allocation
list.
DEASSIGN Releases any devices from your job and clears
logical names.
DISMOUNT Releases disks and tapes from your job, and
removes file structures from your search list.
EOF Writes an end-of-file mark on magnetic tape.
FINISH Closes any open files and releases a device from
your job, clearing logical names.
LABEL Writes an identifier onto DECtape.
LIST Lists a file on the line-printer.
MOUNT Requests ownership of a device.
PRINT Enters files in the line-printer queue.
PUNCH Enters files in the default punch queue.
QUEUE Enters files in the specified queue.
REASSIGN Passes a device from one job to another.
REWIND Rewinds a magnetic tape or DECtape.
SET BLOCKSIZE Sets the default blocksize for a magnetic tape.
SET CDR Sets the file name of the next file to be read
by the card reader.
SET DEFER Defers queueing of output requests until you log
out.
SET DENSITY Sets the default density of the magnetic tape.
SET RETRY Controls error-reporting from magnetic tapes.
SET SPOOL Changes the list of devices that will be spooled
for your job.
SKIP Moves a magnetic tape forward the specified
number of files or records.
TPUNCH Enters files in the paper tape punch queue.
UNLOAD Rewinds and unloads a magnetic tape, DECtape, or
disk.
Program-Preparation Group
Program-Preparation Group
CLOSE Closes the open files on a device.
COMPILE Translates a source program, using the
appropriate compiler.
CREF Generates a cross-reference listing and sends it
to the line printer.
DCORE Writes a core-image file of your program,
including accumulators and job tables.
DDT Loads VMDDT, if necessary, and runs the
debugger.
DEBUG Loads a program and a debugger, then starts the
debugger.
DEPOSIT Puts data into your memory area.
EOF Writes an end-of-file mark on magnetic tape.
EXAMINE Displays the contents of the specified core
address.
FUDGE Creates a library .REL file from a temporary
file.
GLOB Produces a cross-referenced listing of global
symbols.
LOAD Compiles a source file, and loads .REL files
into memory.
MAKE Creates a file with the text editor TECO.
MERGE Loads a second program into memory, to be run
with the first.
SET BREAK Establishes an interrupt point at a specified
location in your program.
TECO Calls the TECO text editor to edit an old file.
Program-Control Group
Program-Control Group
CTRL/C Stops execution of a program, leaving your
(HALT) terminal at monitor level.
CCONTINUE Continues program execution, leaving your
terminal at monitor level.
CONTINUE Continues program execution, leaving your
terminal at user level.
CORE Changes the amount of memory allocated to your
job.
CSTART Starts program execution, leaving your terminal
at monitor level.
EXECUTE Compiles, loads, and runs a program.
GET Loads a program into memory.
JCONTINUE Continues execution of a program after a device
error.
LOAD Runs the loader, and loads the .REL file into
memory.
MERGE Loads a second program into memory, to be run
with the first.
R Runs a system program.
REENTER Restarts program execution at a predefined entry
point.
RUN Begins execution of a program.
SAVE Writes a file of your core image on the
SSAVE specified device.
SET CPU Changes the processor on which your job runs.
SET DDT Enables the DDT breakpoint facility.
BREAKPOINT
SET DEFAULT Allows you to change the number of memory
BUFFERS buffers.
SET DSKFUL Halts your job without destroying your core
image when disk quota is exceeded.
SET DSKPRI Allows you to set the priority of your disk
transfers.
SET FLOATING Sets the system to simulate a floating point.
POINT
SET HPQ Sets the priority of your job in the run queue.
SET PHYSICAL Changes the amount of physical core you can use.
SET TIME Sets a time limit for your job.
SET VIRTUAL Sets the current virtual page limit.
LIMIT
START Begins execution of a loaded program.
Network Group
Network Group
Command Functional Description
Command Functional Description
ASSIGN Allows you to access a device on another system
in the network.
LOCATE Changes the default device list of your job.
NETWORK Prints a list of the nodes in the network.
NODE Prints information about the configuration of
the network.
SET HOST Connects your terminal to the specified host
system.
WHERE Prints the node to which the specified device is
connected.
______________________________________________________________________