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How to preserve line breaks when storing a command output to a variable in bash?
... (one of which is a newline). Then, before invoking echo shell splits that string into multiple arguments using the Internal Field Separator (IFS), and passes that resulting list of arguments to echo. By default, the IFS is set to whitespace (spaces, tabs, and newlines), so the shell chops your $TEM...
What are good uses for Python3's “Function Annotations”
...
How is this better than a docstring for documentation, or explicit type checking in the function? This seems to complicate the language for no reason.
– endolith
Apr 23 '13 at 20:34
...
Pointer vs. Reference
...tional as input parameter
void PrintOptional(const boost::optional<std::string>& optional_str)
{
if (optional_str)
{
cout << *optional_str << std::endl;
}
else
{
cout << "(no string)" << std::endl;
}
}
// Sample method using op...
When is finally run if you throw an exception from the catch block?
...lock, the finally block gets called exactly zero times
static void Main(string[] args)
{
try
{
Console.WriteLine("in the try");
int d = 0;
int k = 0 / d;
}
catch (Exception e)
{
Console.WriteLine("in the catch");
throw;
}
...
Getting the return value of Javascript code in Selenium
...
To return a value, simply use the return JavaScript keyword in the string passed to the execute_script() method, e.g.
>>> from selenium import webdriver
>>> wd = webdriver.Firefox()
>>> wd.get("http://localhost/foo/bar")
>>> wd.execute_script("return 5")
...
逆向工程——二进制炸弹(CSAPP Project) - 操作系统(内核) - 清泛网 - 专注...
...这六个关卡了。
===============phase_1===============
知识点：string，函数调用，栈
用了差不多一个星期断断续续地寻找感觉的phase_1，最主要不知道从何入手。虽然phase_1也不过10+行指令，但最初我的出发点错了：完全依靠人工去读...
使用App Inventor扩展实现多点触控：Rotation Detector · App Inventor 2 中文网
...alizeAngle((float) Math.atan2(v2y, v2x),v2x,v2y);
Log.i("Rotate", String.format("Vector1 (%f,%f) Vector2 (%f,%f)", v1x,v1y,v2x,v2y));
float angle = (float)Math.toDegrees(angle1-angle2);
return angle;
}
private float normalizeAngle(float angle,float x, float y){
...
Insert picture into Excel cell [closed]
...lePathCell As Range
Dim imageLocationCell As Range
Dim filePath As String
Set filePathCell = Application.InputBox(Prompt:= _
"Please select the cell that contains the reference path to your image file", _
Title:="Specify File Path", Type:=8)
Set imageLocationCe...
What's better at freeing memory with PHP: unset() or $var = null
...red to hold whatever value it was previously holding. For example, a long string. If the string wasn't a constant and its reference count drops to zero, then that memory should be freed. Unset is cleaner - it no longer maintains a reference. You do have to wait for garbage collection, but it's s...
JavaScript equivalent of jQuery's extend method
...ault3",
kd2: "default4"
}};
var settings = JSON.parse(JSON.stringify(Object.assign({}, defaults, config)));
console.log(settings.keyDeep); // Object {kd1: "default3", kd2: "default4"}
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