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How to set an environment variable only for the duration of the script?

On Linux (Ubuntu 11.04) in bash, is it possible to temporarily set an environment variable that will only be different from the normal variable for the duration of the script? For example, in a shell script, making an app that saves to HOME portable by temporarily setting HOME to a folder in the pre...
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Refresh image with a new one at the same url

I am accessing a link on my site that will provide a new image each time it is accessed. 19 Answers ...
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How to change the background color of a UIButton while it's highlighted?

...dSet { backgroundColor = isHighlighted ? UIColor.black : UIColor.white } } share | improve this answer | follow | ...
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Dark color scheme for Eclipse [closed]

...Eclipse at all theme-able? I would like to install a dark color scheme for it, since I much prefer white text on dark background than the other way around. ...
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What would cause an algorithm to have O(log n) complexity?

My knowledge of big-O is limited, and when log terms show up in the equation it throws me off even more. 6 Answers ...
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close vs shutdown socket?

In C, I understood that if we close a socket, it means the socket will be destroyed and can be re-used later. 9 Answers ...
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Any reason not to start using the HTML 5 doctype? [closed]

.... When serving as text/html, whether you use XHTML markup or HTML markup, it's treated by browsers as HTML. So, really it comes down to using the shortest doctype that triggers standards mode (<!DOCTYPE html>) and using HTML markup that produces the correct result in browsers. The rest is a...
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How do you explicitly set a new property on `window` in TypeScript?

I setup global namespaces for my objects by explicitly setting a property on window . 22 Answers ...
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Java FileOutputStream Create File if not exists

...utputStream in a way that if a file (String filename) does not exist, then it will create it? 9 Answers ...
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Different bash prompt for different vi editing mode?

When using vi mode (set -o vi) with Bash, it would be nice to have a prompt that depends on the mode you are currently in (insert or command). How does one find out this editing mode? ...