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how to prevent “directory already exists error” in a makefile when using mkdir
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On UNIX Just use this:
mkdir -p $(OBJDIR)
The -p option to mkdir prevents the error message if the directory exists.
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Grep characters before and after match?
...efore and 4 characters after
$> echo "some123_string_and_another" | grep -o -P '.{0,3}string.{0,4}'
23_string_and
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Finding the max value of an attribute in an array of objects
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To find the maximum y value of the objects in array:
Math.max.apply(Math, array.map(function(o) { return o.y; }))
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How do you attach and detach from Docker's process?
I can attach to a docker process but Ctrl + c doesn't work to detach from it. exit basically halts the process.
15 Ans...
Entity Framework and SQL Server View
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We had the same problem and this is the solution:
To force entity framework to use a column as a primary key, use ISNULL.
To force entity framework not to use a column as a primary key, use NULLIF.
An easy way to apply this is to wrap the...
What is the difference between DSA and RSA?
It appears they are both encryption algorithms that require public and private keys. Why would I pick one versus the other to provide encryption in my client server application?
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Fragment transaction animation: slide in and slide out
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UPDATE For Android v19+ see this link via @Sandra
You can create your own animations. Place animation XML files in res > anim
enter_from_left.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http:/...
C++及Windows异常处理(try，catch; __try,__finally, __except) - C/C++ - ...
C++及Windows异常处理(try，catch; __try,__finally, __except)C++及Windows异常处理(try，catch; __try,__finally; __try, __except)一道笔试题引起的探究题目：
int* p = 0x00000000; // pointer to NULL
puts( "hello ");
__try{
puts( "in try ...
What is an NP-complete in computer science?
What is an NP-complete problem? Why is it such an important topic in computer science?
15 Answers
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Optimizing away a “while(1);” in C++0x
Updated, see below!
8 Answers
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