Create a bootable OS X El Capitan installer

This is how to create a OS X El Capitan installer on a flash disk or external disk.

Download OS X El Capitan from the App Store. When it finishes downloading, quit the installer. The “Install OS X El Capitan” application should be in your /Applications folder. On a side note even if you do not create a bootable installer, it’s a good idea to get a backup of this installer before running it. After upgrading your system, the installer will remove itself.

Format a flash stick Mac OS Extended (Journaled) with GUID Partition Table

Name the disk “Untitled”. Simply because the command below references the disk by the “Untitled” name.

In Terminal, run:

sudo /Applications/Install\ OS\ X\ El\ –volume /Volumes/Untitled –applicationpath /Applications/Install\ OS\ X\ El\ –nointeraction

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\ 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.