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Linux/Unix command to determine if process is running?
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Sorry, but while the answer is certainly right from a semantic point of view I'm fully against trying to find a process by pattern matching on the process arg vector. Any such approach is doomed to fail sooner or later (you actually admit to that yourself, by saying that ...
Opposite of %in%: exclude rows with values specified in a vector
... variable V1 in a data frame D1 can have values represented by the letters from A to Z. I want to create a subset D2, which excludes some values, say, B, N and T. Basically, I want a command which is the opposite of %in%
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Checking for NULL pointer in C/C++ [closed]
...e language is much simpler and reliance on the pre-processor more common.
From this perspective I'd probably recommend using the NULL macro definition in C.
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unsigned int vs. size_t
...s to use size_t instead of int / unsigned int pretty much everywhere - from parameters for C string functions to the STL. I am curious as to the reason for this and the benefits it brings.
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Will ConfigurationManager.AppSettings[“blah”] throw an exception if “blah” doesn't exist?
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From the MSDN documentation for NameValueCollection.Item Property (String):
Caution
This property returns null in the following cases: 1) if the specified key is not found; and 2) if the specified key is found and its associ...
pg_config executable not found
...try also installing libpq-dev
sudo apt-get install libpq-dev python-dev
From the article: How to install psycopg2 under virtualenv
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Does “\d” in regex mean a digit?
...igit — 1 2 3 — but only odd matches are highlighted, to distinguish it from the case when the whole 123 string is matched.
Most regex consoles highlight contiguous matches with different colors, but due to the plugin settings, terminal limitations or for some other reason, only every other grou...
How to display Base64 images in HTML?
...rking. You may try specifying char set.
<div>
<p>Taken from wikpedia</p>
<img src="data:image/png;base64, iVBORw0KGgoAAAANSUhEUgAAAAUA
AAAFCAYAAACNbyblAAAAHElEQVQI12P4//8/w38GIAXDIBKE0DHxgljNBAAO
9TXL0Y4OHwAAAABJRU5ErkJggg==" alt="Red dot" />
</di...
Entity Framework - Start Over - Undo/Rollback All Migrations
...If you want to run enable-migrations again and you are developing database from scratch you just need to follow the last sentence: delete database and all migration related code. If you started using migrations with existing database you first have to revert all migrations by using the second or thi...
Why does ++[[]][+[]]+[+[]] return the string “10”?
...e over +):
++[[]][0]
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[0]
Because [[]][0] means: get the first element from [[]], it is true that:
[[]][0] returns the inner array ([]). Due to references it's wrong to say [[]][0] === [], but let's call the inner array A to avoid the wrong notation.
++ before its operand means “increment by...