Setup Apache virtual host on Ubuntu

This post is mostly a self reminder. I have updated my system to Ubuntu 14.04 and that leads to set up almost everything once again. I observed that I forgot few key steps about setting this up. So it’s better to note it down so that next time I don’t have to find again.
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More: Array Subset, loop and xargs

Last week I had a requirement to fetch details of some records. For simplicity let’s assume records are id of some entity; I need to get details from an API for those id. Let’s also assume that API accepts 100 id at maximum in a single request. I’d almost 1 million id to fetch details.
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