DDT 音标拼音: [d
, id
, it'i]
点点通,[地球村互联网络词典的简称,是阅读英文电子资料必备的辅助工具]
点点通,[地球村互联网络词典的简称,是阅读英文电子资料必备的辅助工具]
DDT n 1 :
an insecticide that is also toxic to animals and humans ;
banned in the United States since 1972 [
synonym :
{
dichlorodiphenyltrichloroethane }, {
DDT }]
25 Moby Thesaurus words for "
DDT ":
DDD ,
Paris green ,
antimony ,
arsenic ,
arsenic trioxide ,
beryllium ,
bichloride of mercury ,
cadmium ,
carbolic acid ,
carbon monoxide ,
carbon tetrachloride ,
chlorine ,
cyanide ,
hydrocyanic acid ,
hyoscyamine ,
lead ,
mercuric chloride ,
mercury ,
mustard gas ,
nicotine ,
phenol ,
poison gas ,
prussic acid ,
selenium ,
strychnine 1 .
Generic term for a program that assists in debugging other
programs by showing individual {
machine instructions }
in a
readable symbolic form and letting the user change them .
In
this sense the term DDT is now archaic ,
having been widely
displaced by "
debugger "
or names of individual programs like
"{
adb }", "{
sdb }", "{
dbx }",
or "{
gdb }".
2 .
Under {
MIT }'
s fabled {
ITS } {
operating system },
DDT (
running
under the alias HACTRN )
was also used as the {
shell }
or top
level command language used to execute other programs .
3 .
Any one of several specific debuggers supported on early
{
DEC }
hardware .
The {
DEC } {
PDP -
10 }
Reference Handbook (
1969 )
contained a footnote on the first page of the documentation
for DDT that illuminates the origin of the term :
Historical footnote :
DDT was developed at {
MIT }
for the
{
PDP -
1 }
computer in 1961 .
At that time DDT stood for "
DEC
Debugging Tape ".
Since then ,
the idea of an on -
line debugging
program has propagated throughout the computer industry .
DDT
programs are now available for all DEC computers .
Since media
other than tape are now frequently used ,
the more descriptive
name "
Dynamic Debugging Technique "
has been adopted ,
retaining
the DDT abbreviation .
Confusion between DDT -
10 and another
well known pesticide ,
dichloro -
diphenyl -
trichloroethane
(
C14 -
H9 -
Cl5 )
should be minimal since each attacks a different ,
and apparently mutually exclusive ,
class of bugs .
(
The "
tape "
referred to was ,
incidentally ,
not magnetic but
paper .)
Sadly ,
this quotation was removed from later editions
of the handbook after the {
suits }
took over and DEC became
much more "
businesslike ".
The history above is known to many old -
time hackers .
But
there '
s more :
Peter Samson ,
compiler of the original {
TMRC }
lexicon ,
reports that he named "
DDT "
after a similar tool on
the {
TX -
0 }
computer ,
the direct ancestor of the PDP -
1 built at
{
MIT }'
s Lincoln Lab in 1957 .
The debugger on that
ground -
breaking machine (
the first transistorised computer )
rejoiced in the name FLIT (
FLexowriter Interrogation Tape ).
[{
Jargon File }]
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