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What is the difference between user and kernel modes in operating systems?
...rwise, it could set itself to ring 0 and rings would be useless.
In other words, cannot modify the current segment descriptor, which determines the current ring.
cannot modify the page tables: How does x86 paging work?
In other words, cannot modify the CR3 register, and paging itself prevents modi...
Bash continuation lines
...n lines
there is an extra space, because (after bash manual):
If the word is double-quoted, ${name[*]} expands to a single word with
the value of each array member separated by the first character of the
IFS variable
So set IFS='' to get rid of extra space
$ IFS=''
$ echo "${str_array[*...
Difference between 'new operator' and 'operator new'?
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"operator new" vs "new keyword"
– user997112
Aug 8 '14 at 12:27
2
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Why is it OK to return a 'vector' from a function?
Please consider this code. I have seen this type of code several times. words is a local vector. How is it possible to return it from a function?
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Get line number while using grep
...o display the results with the line numbers, you might try this
grep -nr "word to search for" /path/to/file/file
The result should be something like this:
linenumber: other data "word to search for" other data
share
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What are database normal forms and can you give examples? [closed]
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I've never had a good memory for exact wording, but in my database class I think the professor always said something like:
The data depends on the key [1NF], the whole key [2NF] and nothing but the key [3NF].
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Does Foreign Key improve query performance?
... "Foreign Keys are a relational integrity tool" -- please use the word 'relational' with care. Foreign keys are a database concept, a short hand for a referential integrity constraint. They are not part of the relational model. I assume you made a typo.
– onedaywhen
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What is a Maven artifact?
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@davidblaine - not exactly, that sentence uses the word a more general sense.
– Ken Liu
Apr 17 '13 at 3:35
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get and set in TypeScript
...cular, for those not familiar with it, note that you don't incorporate the word 'get' into a call to a getter (and similarly for setters):
var myBar = myFoo.getBar(); // wrong
var myBar = myFoo.get('bar'); // wrong
You should simply do this:
var myBar = myFoo.bar; // correct (get)
myFoo.b...
Meaning of “[: too many arguments” error from if [] (square brackets)
...tcut for the test command), then the string may be split out into multiple words. Each of these is treated as a separate argument.
So that one variable is split out into many arguments:
VARIABLE=$(/some/command);
# returns "hello world"
if [ $VARIABLE == 0 ]; then
# fails as if you wrote:
...