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How do I close all open tabs at once?
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Shortest/simplest/fastest way would be:
:qa
To save work in all tabs and quit:
:wqa
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How do I grab an INI value within a shell script?
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This is not really a good solution. Think of having 2 [parameters.ini] sections with each having a ' database_version' variable. You get the value twice then.
– nerdoc
May 26 '15 at 12:19
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Select DISTINCT individual columns in django?
...g note in the docs about using distinct(). The above example will work but all combinations of distinct() and values() may not.
PS: it is a good idea to use lower case names for fields in a model. In your case this would mean rewriting your model as shown below:
class ProductOrder(models.Model):
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What's to stop malicious code from spoofing the “Origin” header to exploit CORS?
...header Origin: http://foo.com , and bar must respond with Access-Control-Allow-Origin: http://foo.com .
3 Answers
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What is %2C in a URL?
... | C | 63 | c |
| 04 | EOT | 24 | $ | 44 | D | 64 | d |
| 05 | ENQ | 25 | % | 45 | E | 65 | e |
| 06 | ACK | 26 | & | 46 | F | 66 | f |
| 07 | BEL | 27 | ' | 47 | G | 67 | g |
| 08 | BS | 28 | ( | 48 | H | 68 | h |
| 09 | TAB | 29 | ) | 49 | I | 69 | i |
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Declaring pointers; asterisk on the left or right of the space between the type and name? [duplicate
...r;
is emphasizing the type of the pointer variable. It is saying, essentially, "the type of somePtr is pointer-to-someType".
The style
someType *somePtr
is emphasizing the type of the pointed-to data. It is saying, essentially, "the type of data pointed to by somePtr is someType".
They both m...
How do I get elapsed time in milliseconds in Ruby?
... yes, but giving just "Time.now" is inaccurate and does not answer the question precisely.
– LowFieldTheory
Nov 8 '19 at 14:46
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What is the easiest way to duplicate an activerecord record?
...ID.
Note that it does not copy associations, so you'll have to do this manually if you need to.
Rails 3.1 clone is a shallow copy, use dup instead...
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What exactly does big Ө notation represent?
I'm really confused about the differences between big O, big Omega, and big Theta notation.
6 Answers
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二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
二维码的生成细节及原理二维码又称QR Code，QR全称Quick Response，是一个近几年来移动设备上超流行的一种编码方式，它比传统的Bar Code条形码能存更多的信息，...二维码又称QR Code，QR全称Quick Response，是一个近几年来移动设备上超...