Remove Caches and Preferences directory on the latest used Simulator app so it gets rebooted to its initial state.

gistfile1.txt

#!/bin/bash

simulatorDirectory="$HOME/Library/Developer/CoreSimulator/Devices"
latestSimulator=$(ls -Ft "$simulatorDirectory"| grep / | head -1)
applicationsDirectory="$simulatorDirectory""/""$latestSimulator/Applications/"
latestApp=$(ls -t "$applicationsDirectory" | head -1)
appDirectory="$applicationsDirectory""/""$latestApp"
libraryDirectory="$appDirectory/Library" 
prefDir="$libraryDirectory/Preferences"
cachesDirectory="$libraryDirectory/Caches"

rm -r "$cachesDirectory"
rm -r "$prefDir"