My Bash Profile

.bash_profile

# Setting PATH for Python 3.6
# The original version is saved in .bash_profile.pysave
PATH="/Library/Frameworks/Python.framework/Versions/3.6/bin:${PATH}"
export PATH
export PS1="\w 🤡 🤡 🤡 :  "

if [ -f ~/.git-completion.bash ]; then
  . ~/.git-completion.bash
fi

print_before_the_prompt () {
	echo '***************************************************'
	echo '*                                                 *'
  	echo "*  ${USER}: ${PWD}                        *"
	echo '*                                                 *'
	echo '*  To use custom function, please type: sheldon.  *'
	echo '*                                                 *'	
  	echo '***************************************************'
}
 
#PROMPT_COMMAND=print_before_the_prompt

sheldon () {
	echo "use -rv- to record simulator video"
	echo "use -cg- to convert video to gif, use -h to check options"
	echo "use -wfp_off- to turnoff wifi proxy"
	echo "use -wfp_on- to turnon wifi proxy"
	echo "use -wfp- to check proxy status"
	echo "**** check bash_profile for above custom functions ****"
}

rv () {
	if [ -z "$1" ]
	then
	  	echo "No video name is given, will store video as ~/Desktop/in.mov"
	  	xcrun simctl io booted recordVideo ~/Desktop/in.mov
	else
	 	NAME=$1
		echo "Got video name, no file extension is needed. Will store video as ~/Desktop/${NAME}.mov"
		xcrun simctl io booted recordVideo ~/Desktop/${NAME}.mov
	fi
}


cg () {
	usage() { 
		echo "Usage:"
		echo "[-s start time, default 00:00:00, watch format]"
		echo "[-t end time, default null, watch format]"
		echo "[-n input video name, default in.mov]"
		echo "[-y <1|2>], 1, for iPhone7, 2 for iPhoneX, default 1]"
		echo "[-r frame rate, default 8, use frame rate to adjust output file size]"
		exit 0
	}

	while getopts ":s:t:n:y:r:h" o; do
		case ${o} in
			s)
				s=${OPTARG}
				;;
			n)
				n=${OPTARG}
				;;
			y)
				y=${OPTARG}
				((y == 1 || y == 2))
				;;
			r)
				r=${OPTARG}
				;;
			t)
				t=${OPTARG}
				;;				
			h)
				usage
				;;
		esac
	done
	shift $((OPTIND-1))

	if [ -z "$s" ]; then 
		s="00:00:00"
	fi
	if [ -z "$n" ]; then
		n="in.mov"
	fi
	if [ -z "$y" ]; then
		y="1"
	fi
	if [ -z "$r" ]; then 
		r="10"
	fi

	echo ${y}
	if (( y == 1 )); then
		echo "Choosing regular screen scale as 512:909"
		ratio="512:909"
	elif (( y == 2 )); then
		echo "Chossing iPhoneX screen scale as 512:1024"
		ratio="512:1024"
	else
		usage
		exit 0
	fi
	
	#echo "Used paprams:"
	#echo "starting time = ${s}"
	#echo "end time = ${t}"
	#echo "input file name = ${n}"
	#echo "screen type = ${st}"
	#echo "frame rate = ${r}"
	
	if [ -z "${t}" ]; then
		ffmpeg -ss "${s}" -i ~/desktop/"${n}" -pix_fmt rgb8 -r "${r}" -vf scale="${ratio}"  output.gif && gifsicle -O3 output.gif -o output.gif && mv output.gif ~/desktop/
	else
		ffmpeg -ss "${s}" -t ${t} -i ~/desktop/"${n}" -pix_fmt rgb8 -r "${r}" -vf scale="${ratio}"  output.gif && gifsicle -O3 output.gif -o output.gif && mv output.gif ~/desktop/
	fi
	
	echo "Used paprams:"
	echo "starting time = ${s}"
	echo "end time = ${t}"
	echo "input file name = ${n}"
	echo "screen type = ${st}"
	echo "frame rate = ${r}"
	echo "ratio = ${ratio}"
	
	echo "Gif is stored as ~/Desktop/output.gif 🤡 🤡 🤡 "
	exit 1
}

wfp_off () {
	networksetup -setautoproxystate "Wi-Fi" off
}

wfp_on () {
	networksetup -setautoproxyurl "Wi-Fi" "http://www.muc/proxy.pac"
}

wfp () {
	scutil --proxy
}

To custom terminal, here is the guide:
https://www.booleanworld.com/customizing-coloring-bash-prompt/