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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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How to serialize a lambda?

How can I elegantly serialize a lambda? 5 Answers 5 ...
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List files committed for a revision

How do I list the file names/paths that are committed, using a revision number? 3 Answers ...
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Pass correct “this” context to setTimeout callback?

How do I pass context into setTimeout ? I want to call this.tip.destroy() if this.options.destroyOnHide after 1000 ms. How can I do that? ...
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iPhone Data Usage Tracking/Monitoring

I've searched over this topic but found very few details which were helpful. With these details I've tried to cook some code as follows. ...
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How do I run git log to see changes only for a specific branch?

I have a local branch tracking the remote/master branch. After running git-pull and git-log , the log will show all commits in the remote tracking branch as well as the current branch. However, because there were so many changes made to the remote branch, I need to see just the commits made to th...
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Is there a Python caching library?

I'm looking for a Python caching library but can't find anything so far. I need a simple dict -like interface where I can set keys and their expiration and get them back cached. Sort of something like: ...
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Convert Object to JSON string

jQuery.parseJSON('{"name":"John"}') converts string representation to object but I want the reverse. Object is to be converted to JSON string I got a link http://www.devcurry.com/2010/03/convert-javascript-object-to-json.html but it need to have json2.js do jQuery has a native method to do this? ...
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How to check if a Unix .tar.gz file is a valid file without uncompressing?

I have found the question How to determine if data is valid tar file without a file? , but I was wondering: is there a ready made command line solution? ...
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How do I get AWS_ACCESS_KEY_ID for Amazon?

I'm totally new to AWS. 5 Answers 5 ...