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What is the email subject length limit?

How many characters are allowed to be in the subject line of Internet email? I had a scan of The RFC for email but could not see specifically how long it was allowed to be. I have a colleague that wants to programmatically validate for it. ...
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Vagrant ssh authentication failure

The problem with ssh authentication: 29 Answers 29 ...
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How can I save a screenshot directly to a file in Windows? [closed]

In Windows XP, one can press Alt-PrintScreen to copy an image of the active window, or Ctrl-PrintScreen to copy an image of the full desktop. ...
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How do I get the row count of a pandas DataFrame?

I'm trying to get the number of rows of dataframe df with Pandas, and here is my code. 14 Answers ...
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Use IntelliJ to generate class diagram

How do I get IntelliJ 10.5 (on the Mac) to generate a class diagram showing all of the classes in my project? I'm sure I'm overlooking something obvious, but I can only get the "Show Diagram" feature to show one class at a time. (I also figured out how to add additional classes, but again, only on...
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What does the “@” symbol mean in reference to lists in Haskell?

I've come across a piece of Haskell code that looks like this: 4 Answers 4 ...
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What do people think of the fossil DVCS? [closed]

fossil http://www.fossil-scm.org I found this recently and have started using it for my home projects. I want to hear what other people think of this VCS. ...
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How to avoid overflow in expr. A * B - C * D

I need to compute an expression which looks like: A*B - C*D , where their types are: signed long long int A, B, C, D; Each number can be really big (not overflowing its type). While A*B could cause overflow, at same time expression A*B - C*D can be really small. How can I compute it correctly...
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Underscore: sortBy() based on multiple attributes

I am trying to sort an array with objects based on multiple attributes. I.e if the first attribute is the same between two objects a second attribute should be used to comapare the two objects. For example, consider the following array: ...
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What is the maximum length of a URL in different browsers?

What is the maximum length of a URL in different browsers? Does it differ among browsers? 18 Answers ...