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How to empty/destroy a session in rails?

I can't seem to find it anywhere... How do I delete/destroy/reset/empty/clear a user's session in Rails? Not just one value but the whole thing.. ...
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PHP Regex to get youtube video ID?

Can someone show me how to get the youtube id out of a url regardless of what other GET variables are in the URL. 19 Answer...
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Import text file as single character string

How do you import a plain text file as single character string in R? I think that this will probably have a very simple answer but when I tried this today I found that I couldn't find a function to do this. ...
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How do I find the width & height of a terminal window?

As a simple example, I want to write a CLI script which can print = across the entire width of the terminal window. 9 Ans...
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Webfont Smoothing and Antialiasing in Firefox and Opera

I have custom-made web fonts used on my site. To style my rendering output, I used the following code: 8 Answers ...
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Getting the client's timezone offset in JavaScript

How can I gather the visitor's time zone information? I need the Timezone, as well as the GMT offset hours. 26 Answers ...
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How to increase space between dotted border dots

I am using dotted style border in my box like 17 Answers 17 ...
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PHP Regex to check date is in YYYY-MM-DD format

I'm trying to check that dates entered by end users are in the YYYY-MM-DD. Regex has never been my strong point, I keep getting a false return value for the preg_match() I have setup. ...
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File being used by another process after using File.Create()

I'm trying to detect if a file exists at runtime, if not, create it. However I'm getting this error when I try to write to it: ...
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How to save traceback / sys.exc_info() values in a variable?

I want to save the name of the error and the traceback details into a variable. Here's is my attempt. 5 Answers ...