Slow zoom on OS X Yosemite

If you use Zoom controls from Accessibility system pref, and using an external monitor, you may have experienced *very* slow performance after upgrading to Yosemite.

One workaround is to set Zoom Style to “Picture-in-picture”.

adjust-size

Then, click “More Options” and click “Adjust Size and Location” to change the size of the Picture-in-picture.

picture-in-picture

From what I’ve read, 10.10.2 may solve this issue. Some user’s of the beta reported better performance.

How to stop Amazon Music Helper from running in the background OSX

After installing Amazon Music on my mac, I noticed this background task “Amazon Music Helper” running. I tried to kill it, it came back.

The fix I used was to remove execute permission on that file:

chmod -x /Applications/Amazon\ Music.app/Contents/MacOS/Amazon\ Music\ Helper

Then kill the process again and it shouldn’t come back.

I have bought music since then and find that all the features (that I use) work fine. This thing isn’t even needed!

Start a screen session as another user at system startup

Came across this technique to get a screen session started as another non-root user on system startup. You could have this command in /etc/rc.local or any other location that runs on system startup as root.

Also, it doesn’t have to just be at system startup. These commands could be used at any time by the root user to start a screen session for another user.

This command must run as root. I had best luck when providing full paths to the executable and optional file arguments (like if you are passing a conf file)

su - username -c "/usr/bin/screen -dmS screenname ./executable"

So, for example, to get irssi started as chris in a screen session named irc, You could:

su - chris -c "/usr/bin/screen -dmS irc /usr/bin/irssi"

You can then log in to the box as chris and resume the screen session that root started.

Apache Proxy with CORS headers

Here is a nice trick to add a proxy that your HTML5 application can use to connect to any remote proxy. Apache can proxy the API request while also injecting the CORS header Access-Control-Allow-Origin to that remote API reponse.

Requirements:
Apache mod_proxy
Apache mod_headers

# Proxy for BaseServer
<LocationMatch "/api">
   ProxyPass http://remote-server.com:8000/api/
   Header add "Access-Control-Allow-Origin" "*"
</LocationMatch>

http://enable-cors.org/server_apache.html