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How to tell if node.js is installed or not

I've recently installed node.js and I have no idea how to run applications. I installed node.js but couldn't find further instructions. What does one really need to do? I wanted to see if it was actually working. So I executed a script called hello.js. It went as such: ...
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The model backing the context has changed since the database was created

... I've changed my production db manually and turned off the migration and it works, Thanks – Mohsen Afshin Sep 10 '12 at 21:05 13 ...
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How to fix .pch file missing on build?

...es, select All Configurations from the drop-down menu. Open the C/C++ tree and select Precompiled Headers Precompiled Header: Select Use (/Yu) Fill in the Precompiled Header File field. Standard is stdafx.h Click Okay If you do not have stdafx.h in your Header Files put it there. Edit it to #include...
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How do you find the disk size of a Postgres / PostgreSQL table and its indexes

I'm coming to Postgres from Oracle and looking for a way to find the table and index size in terms of bytes/MB/GB/etc , or even better the size for all tables. In Oracle I had a nasty long query that looked at user_lobs and user_segments to give back an answer. ...
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What is Full Text Search vs LIKE

... In general, there is a tradeoff between "precision" and "recall". High precision means that fewer irrelevant results are presented (no false positives), while high recall means that fewer relevant results are missing (no false negatives). Using the LIKE operator gives you 100%...
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Convert PHP closing tag into comment

...enate the string from two pieces. This way, the closing tag is cut in two, and is not a valid closing tag anymore. '?>' --> '?'.'>' In your code: $string = preg_replace('#<br\s*/?'.'>(?:\s*<br\s*/?'.'>)+#i', '<br />', $string); This will make // comments work. For /*...
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Different ways of adding to Dictionary

What is the difference in Dictionary.add(key, value) and Dictionary[key] = value ? 8 Answers ...
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What does set -e mean in a bash script?

... From help set : -e Exit immediately if a command exits with a non-zero status. But it's considered bad practice by some (bash FAQ and irc freenode #bash FAQ authors). It's recommended to use: trap 'do_something' ERR to run do_something function when errors occur. ...
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Pull new updates from original GitHub repository into forked GitHub repository

I forked someone's repository on GitHub and would like to update my version with commits and updates made in the original repository. These were made after I forked my copy. ...
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How can one use multi threading in PHP applications

... force the operating system to load another instance of the PHP executable and handle other simultaneous processes. 18 Answ...