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Right query to get the current number of connections in a PostgreSQL DB
...ed Mar 11 '11 at 8:52
Magnus HaganderMagnus Hagander
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Upgrade python in a virtualenv
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Did you see this? If I haven't misunderstand that answer, you may try to create a new virtualenv on top of the old one. You just need to know which python is going to use your virtualenv (you will need to see your virtualenv version).
If your virtualenv is install...
How do you get the list of targets in a makefile?
I've used rake a bit (a Ruby make program), and it has an option to get a list of all the available targets, eg
20 Answers
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Browse orphaned commits in Git
...y git repository has somehow gone wonky - I loaded up msysgit this morning and instead of the branch name being shown after the current directory, it says "((ref: re...))", 'git status' reports everything as a new file, 'git log' and 'git reflog' tell me "fatal: bad default revision 'HEAD'", and so ...
ActiveMQ or RabbitMQ or ZeroMQ or [closed]
We'd be interested to hear any experiences with the pros and cons of ActiveMQ vs RabbitMQ vs ZeroMQ. Information about any other interesting message queues is also welcome.
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Prevent scrolling of parent element when inner element scroll position reaches top/bottom? [duplicat
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It's possible with the use of Brandon Aaron's Mousewheel plugin.
Here's a demo: http://jsbin.com/jivutakama/edit?html,js,output
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What is the meaning of the term “thread-safe”?
...must satisfy the need for multiple threads to access the same shared data, and the need for a shared piece of data to be accessed by only one thread at any given time.
There are a few ways to achieve thread safety:
Re-entrancy:
Writing code in such a way that it can be partially exec...
How do you merge two Git repositories?
... rewriting the history as described in other answers.
The git-subtree command is a part of official git-contrib, some packet managers install it by default (OS X Homebrew).
But you might have to install it by yourself in addition to git.
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How to show and update echo on same line
...hat could do this if I added a 3rd escape character.
The 2 options are -n and -e.
-n will not output the trailing newline. So that saves me from going to a new line each time I echo something.
-e will allow me to interpret backslash escape symbols.
Guess what escape symbol I want to use for this...
How to fix SSL certificate error when running Npm on Windows?
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TL;DR - Just run this and don't disable your security:
Replace existing certs
# Windows/MacOS/Linux
npm config set cafile "<path to your certificate file>"
# Check the 'cafile'
npm config get cafile
or extend existing certs
Set this e...