I had a software update on my phone and referred to my earlier post on a
Tethering Fix for Xperia Z2 on Lollipop 5.0 when I realised I didn’t have adb in my path anymore. For those who have moved up to Android Studio and not updated your path, you’ll need to add something like this to your .bashrc or .bash_profile
PATH=~/Library/Android/sdk/platform-tools:$PATH