It's my own cheat sheet to write bash scripts easily.

Bash Script cheat sheet

# Variables
IP=`ifconfig | grep inet | awk {'print $2'} | grep -Ev "127.0.0.1|:"`

### Ask y/n question
printf "Question? (y/n) "
read answer
if [[ "$answer" == "y" ]]; then
	# True condition
	
else
	# False condition
	
fi

### Check root access
if [ "$(whoami)" != "root" ]; then
        echo "Sorry, You must run this script with root privileges"
        exit 1
fi


### Check Network connectivity (Internet ping and DNS)
if ping -q -c 1 -W 1 google.com >/dev/null; then
  echo "The network is up"
else
  echo "The network is down"
fi