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The CREF command runs the CREF program, which produces cross-reference
listings from files of type .CRF.
@CREF destination-filespec=source-filespec /switch(es)
destination-filespec is the name of the file or device to
which you want to send the processed
contents of the .CRF file.
Default - LPT:
source-filespec is the name of the .CRF file you want to
Default - the names of all files of
type .CRF produced during
the current terminal
/switch is one or more keywords from the following list.
CREF Program Switches
/A Advances magnetic tape reel by one file. You can
type this switch more than once in the command
/B Backspaces magnetic tape reel by one file. You
can type this switch more than once in the command
/C Cancels the processing of any switches in your
/D Restores the processing of any default switches in
your SWITCH.INI file.
/H Types the CREF help file. /H is illegal in a
/K Suppresses Regular Symbol Table in the CREF
/M Suppresses OPDEF/Macro Table in the CREF listing.
/O Includes the Op Code Table in the CREF listing.
/P Preserves an input file with the file type .CRF or
.LST. These types of input files are normally
/R Requests the line number at which the CREF listing
is to start. CREF types out "RESTART LISTING AT
LINE:", after which you type the line number and
press RETURN. If you use an indirect file, CREF
looks for the number in the indirect file. /R is
most useful for physical (non-spooled) line
printers, and is illegal in a SWITCH.INI file.
/S Suppresses the program listing and lists only the
tables you select.
/T Skips to the logical end of the magnetic tape.
/W Rewinds the magnetic tape.
/Z Zeroes the DECtape directory. This is a
historical switch, and is illegal.
Current .CRF Files
If you have files of type .CRF produced by LOAD-class
commands during the current terminal session, the unmodified
command CREF produces listings of them and deletes the
files. By supplying an argument of the form shown in the
Format section above, you can copy the listing for a current
.CRF file to another file or device. To run the CREF
program yourself when you have current .CRF files, give the
command R CREF instead.
.CRF Files From a Previous Session
If your only files of type .CRF (created by the CREF program
or one of the LOAD-class commands) were produced during a
previous terminal session, the command CREF puts your
terminal at command level in the CREF program, symbolized by
an asterisk (*). Thus it is equivalent to the command R
CREF in this case. See Hints - Further Information, below,
for advice on how to proceed.
Producing .CRF Files
You can produce cross-reference files by including the /CREF
switch in any LOAD-class command that actually causes a
compilation (i.e., is not prevented from doing so by a
/RELOCATABLE switch or by the existence of current object
Preserving .CRF Files After Processing
Give the /P switch immediately after the CREF command to
preserve .CRF files. Ordinarily they are deleted after
being sent to an output device or copied into another file.
For more detailed information, see the TOPS-20 User
Effect on Memory and Terminal
The CREF command replaces the contents of any unkept forks in
memory with the CREF program and leaves your terminal at TOPS-20
command level, or at command level within CREF (denoted by an
asterisk prompt [*]).
LOAD-class commands for producing .CRF files
1. Give the CREF command to obtain a listing of your .CRF file.
2. Compile two FORTRAN programs, using the /CREF switch to
produce .CRF files. Then give the CREF command to obtain
listings of these, and use the /P switch to preserve the .CRF
@COMPILE /CREF TESTF1.FOR, TESTF2.FOR
3. Determine what .CRF files you have, then mount a tape. Give
the CREF command, and once within the CREF program, have the
cross-reference listing produced from one of these files
copied onto tape. (The .CRF files are not processed
automatically when you give the CREF command because they
were produced during a previous terminal session.)
Total of 2 files
@MOUNT TAPE CRFMAC:/WRITE-ENABLED
[Mount Request CRFMAC Queued, Request-ID 128]
[Tape set CRFMAC, volume CRFMAC mounted]
[CRFMAC defined as MT3:]
[CRFXKC 4K core]
@DISMOUNT TAPE CRFMAC:
[Tape dismounted, logical name CRFMAC: deleted]