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Copy files without overwrite

I just can't seem to find a way on the command line to say "copy all the files from directory A to directory B, but if the file already exists in directory B, don't overwrite it, no matter which file is newer, and don't prompt me." ...
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Is there a JavaScript function that can pad a string to get to a determined length?

I am in need of a JavaScript function which can take a value and pad it to a given length (I need spaces, but anything would do). I found this: ...
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Best way to select random rows PostgreSQL

I want a random selection of rows in PostgreSQL, I tried this: 12 Answers 12 ...
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Easiest way to pass an AngularJS scope variable from directive to controller?

... so complex, isn't there a way I can access a controller from a directive, and set one of it's scope variables? 2 Answers ...
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“A project with an Output type of Class Library cannot be started directly”

I downloaded a C# project and I wish to debug the project to see how an algorithm implementation works. 12 Answers ...
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Is there a difference between single and double quotes in Java?

Is there a difference between single and double quotes in Java? 4 Answers 4 ...
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LINQ: Select an object and change some properties without creating a new object

...ome properties of a LINQ query result object without creating a new object and manually setting every property. Is this possible? ...
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How can I run a function from a script in command line?

... If the script only defines the functions and does nothing else, you can first execute the script within the context of the current shell using the source or . command and then simply call the function. See help source for more information. ...
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How to find time complexity of an algorithm

...chine instructions it will execute as a function of the size of its input, and then simplify the expression to the largest (when N is very large) term and can include any simplifying constant factor. For example, lets see how we simplify 2N + 2 machine instructions to describe this as just O(N). ...
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How to convert local time string to UTC?

...igure out what the local timezone is, construct a timezone object from it, and manipulate and attach it to the naive datetime. Finally, use datetime.astimezone() method to convert the datetime to UTC. Source code, using local timezone "America/Los_Angeles", for the string "2001-2-3 10:11:12": imp...