User`s guide
DUMP
13-Feb-91
MEMO1 .TXT 1 13-Feb-91 MEMO2 .TXT 6 13-Feb-91
2 Files, 7 Blocks
779 Free blocks
The preceding directory listing contains two files. If you examine that directory
with the command DUMP/NOASCII/RAD50/ONLY:6, you get the following directory
listing. Note the input file specification at the start of directory dump listing DU:/N
/X/O:6:
DU: Is the device containing the volume with the directory to be examined.
/N Specifies that ASCII output be suppressed. Since ASCII binary code is
not used to store information in RT–11 directories, ASCII translations of
directory information would produce useless information.
/X Specifies Radix–50 output since RT–11 uses Radix–50 code to store
information in directories. This is a code that is more compact than
ASCII and can store three characters in a binary word (rather than
two). In the following listing, the letters and numbers beneath the octal
words are the Radix–50 equivalents of those words. If you look carefully
at the Radix–50 equivalents, you can see (in groups of two and three
alphanumeric characters) the names of the files listed in the preceding
directory.
/O:6 Specifies the listing contain only the information in block 6. RT–11
directories on random-access devices always begin in block 6. So, if you
want a dump of a directory on a random-access device, begin with block 6;
that is, specify /S:6 (for start at block 6).
In the following example, the option /O (for /ONLY) is the letter O. And
only a listing of block 6 is requested.
Note that only the first 96 bytes of the 512-byte block of the dump listing are shown
in the following example. Since the listing is of a directory containing only two files,
the rest of the listing is of unused bytes.
Sample Directory Listing
DZ:/N/X/O:6
BLOCK NUMBER 000006
000/ 000004 000000 000001 000000 000016 002000 051025 061230
D A N YX MEM O1
020/ 100324 000001 000000 004663 002000 051025 061300 100324
TXT A AVC YX MEM O2 TXT
040/ 000006 000000 004663 001000 000325 063471 023364 001413
F AVC L2 EM PTY FIL SS
060/ 000000 004663 004000 000000 000000 000000 000000 000000
AVC AKH
100/ 000000 000000 000000 000000 000000 000000 000000 000000
120/ 000000 000000 000000 000000 000000 000000 000000 000000
See the RT–11 System Utilities Manual for more examples of using DUMP.
RT–11 Command Descriptions 101