Clean up ghost iOS simulators in `xcrun simctl`

clean-up-ghost-devices.sh

#!/bin/sh
# I was having ghost devices in my iOS Simulator.
# There were multiple device for one device type, one OS.
# For example, there were at least 4-5 devices for iPhone 6, OS 8.4

# USE IT AT YOUR OWN RISK

devices=(`xcrun simctl list devices | grep -v '^[-=]' | cut -d "(" -f2 | cut -d ")" -f1`)

for device in $devices; do
  xcrun simctl boot $device 1>/dev/null 2>&1 || xcrun simctl delete $device && xcrun simctl shutdown $device
done