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Bootstrap dropdown sub menu missing

Bootstrap 3 is still at RC, but I was just trying to implement it. I couldn't figure out how to put a sub menu class. Even there is no class in css and even the new docs don't say anything about it ...
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What's the opposite of head? I want all but the first N lines of a file

Given a text file of unknown length, how can I read, for example all but the first 2 lines of the file? I know tail will give me the last N lines, but I don't know what N is ahead of time. ...
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Purge Kafka Topic

Is there a way to purge the topic in kafka? 19 Answers 19 ...
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Where should virtualenvs be created?

I'm confused as to where I should put my virtualenvs. 5 Answers 5 ...
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Accessing last x characters of a string in Bash

I found out that with ${string:0:3} one can access the first 3 characters of a string. Is there a equivalently easy method to access the last three characters? ...
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str.startswith with a list of strings to test for

I'm trying to avoid using so many if statements and comparisons and simply use a list, but not sure how to use it with str.startswith : ...
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jQuery Multiple ID selectors

Here's a snippet of the start of my code: 6 Answers 6 ...
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How to use clock() in C++

How do I call clock() in C++ ? 7 Answers 7 ...
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Are there pronounceable names for common Haskell operators? [closed]

I'm reading Learn You a Haskell for Great Good , and I never know how to pronounce the Haskell operators. Do they have "real" names? ? ...
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Git fast forward VS no fast forward merge

Git merge allow us to perform fast forward and no fast fast forward branch merging. Any ideas when to use fast forward merge and when to use no fast forward merge? ...