This shell script prints all the CSS/JS in the same index.html file

build-prod.sh

#!/bin/sh

# usage: ./build-prod.sh < index.html > index-prod.html

cssURLs=()
jsURLs=()
cssReg="<link.*['\"](.*\.css)['\"].*>"
jsReg="<script.*['\"](.*\.js)['\"].*></script>"

while read line
do

if [[ $line =~ $cssReg ]]; then
	cssURLs+=(${BASH_REMATCH[1]})
elif [[ $line =~ $jsReg ]]; then
	jsURLs+=(${BASH_REMATCH[1]})
elif [[ $line = "</head>" ]]; then
	echo "<style>"
	cat ${cssURLs[@]}
	echo "</style>"
	echo "</head>"
elif [[ $line = "</body>" ]]; then
	echo "<script>"
	cat ${jsURLs[@]}
	echo "</script>"
	echo "</body>"
else
	echo $line
fi

done