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Get environment variable value in Dockerfile

I'm building a container for a ruby app. My app's configuration is contained within environment variables (loaded inside the app with dotenv ). ...
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Git copy file preserving history [duplicate]

I have a somewhat confusing question in Git. Lets say, I have a file dir1/A.txt committed and git preserves a history of commits ...
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Checking for empty queryset in Django

What is the recommended idiom for checking whether a query returned any results? Example: 7 Answers ...
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How to use the TextWatcher class in Android?

Can anyone tell me how to mask the substring in EditText or how to change EditText substring input to password type or replace by another character like this 123xxxxxxxxx3455 ...
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How to delete a row by reference in data.table?

My question is related to assignment by reference versus copying in data.table . I want to know if one can delete rows by reference, similar to ...
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Difference between JSONObject and JSONArray

After having a short look at Google I found this link that describes the difference, yet from a syntax point of view. 8 A...
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`static` keyword inside function?

I was looking at the source for Drupal 7, and I found some things I hadn't seen before. I did some initial looking in the php manual, but it didn't explain these examples. ...
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How do I make curl ignore the proxy?

How do I make curl ignore the proxy? Setting $NO_PROXY doesn't seem to work for me. 12 Answers ...
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How to use a keypress event in AngularJS?

I want to catch the enter key press event on the textbox below. To make it more clear I am using a ng-repeat to populate the tbody. Here is the HTML: ...
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Confused by python file mode “w+”

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