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Postgresql: Conditionally unique constraint

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ALTER TABLE, set null in not null column, PostgreSQL 9.1

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How to test an Internet connection with bash?

... Without ping #!/bin/bash wget -q --spider http://google.com if [ $? -eq 0 ]; then echo "Online" else echo "Offline" fi -q : Silence mode --spider : don't get, just check page availability $? : shell return code 0 : shell "All OK" code Without wget #!/bin/bash echo...
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What, why or when it is better to choose cshtml vs aspx?

...e. The .aspx extension simply loads the aspnet_isapi.dll that performs the compile and serves up web forms. The difference in the handler mapping is simply a method of allowing the two to co-exist on the same server allowing both MVC applications and WebForms applications to live under a common root...
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Specify format for input arguments argparse python

I have a python script that requires some command line inputs and I am using argparse for parsing them. I found the documentation a bit confusing and couldn't find a way to check for a format in the input parameters. What I mean by checking format is explained with this example script: ...
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WhatsApp API (java/python) [closed]

... @ndomanyo My try with Yowsup was few months back. So my comments could be outdated. But yes, after successfully using Yowsup, when I started getting high traffic, my number was blocked by Whatsapp. I dont know if there has been any change in the policy since then. User agent is ...
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is there any way to force copy? copy without overwrite prompt, using windows?

I want to write a list of windows commands(it's a long list) where it does all these magical things for me, but whenever I use copy, it stops to ask fro overwrite prompt. When I type yes, it overwrites the old file then just stops there. ...
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Execute AsyncTask several times

... edited Jun 20 at 9:12 Community♦ 111 silver badge answered Jun 16 '11 at 14:49 Steve PrenticeSteve...
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How do you Programmatically Download a Webpage in Java

...I can do some processing on it. Also, how could I handle various types of compression. 11 Answers ...
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What's the best way to get the current URL in Spring MVC?

...ServletRequest object and it's getParameter...() methods to rebuilt the complete URL including (and only) it's GET parameters. ...