Helper script for my StackOverflow answer https://stackoverflow.com/questions/8988855/include-another-html-file-in-a-html-file/15250208#15250208

escapeHTML.sh

#!/bin/bash
#
# escapeHTML.sh by Martin Wermers[1], 2018
# Written for my answer on the StackOverflow question 'Include another HTML file in a HTML file':
# https://stackoverflow.com/questions/8988855/include-another-html-file-in-a-html-file/15250208#15250208
#
# This work is licensed under a Creative Commons Attribution-ShareAlike 4.0
# International License. See https://creativecommons.org/licenses/by-sa/4.0 .
#
# Credits to Greg Minshall[2] for the improved sed command that also escapes
# back slashes and single quotes, which my original sed command did not
# consider.
# 
# [1] https://stackoverflow.com/users/841103/tafkadasoh
# [2] https://stackoverflow.com/users/1527747/greg-minshall


# Checking correct number of arguments
if [[ "$#" == 0 ]]; then 
    echo 'Please enter the filename of the HTML file that should be escaped for insertion via JavaScript.'
    exit 1
fi
if [[ "$#" > 1 ]]; then 
    echo 'Too many arguments. Please pass only one filename at a time.'
    exit 1
fi

# Checking for existance of entered file
if [[ ! -f $1 ]]; then
	echo "WARNING! The file you have entered does not exist!"
	exit 1
fi

filename=$(basename "$1")
extension="${filename##*.}"
filename="${filename%.*}"
targetFile="${filename}.js"

echo "document.write('\\" > $targetFile
sed 's/\\/\\\\/g;s/^.*$/&\\/g;s/'\''/\\'\''/g' $1 >> $targetFile
echo "');" >> $targetFile

echo "The file '$1' was converted into '$targetFile'."
echo "To include it in another HTML file, just enter the following line at the desired position for insertion:"
echo ""
echo "    <script src=\"$targetFile\"></script>"
echo ""
exit 0

Thanks for the script and the answer on Stackoverflow!

Since the script is designed to include external files in an HTML file, the user may need to organize these files in a tree architecture. To accommodate this, I would suggest adding the instruction foldername=$(dirname "$1") in line 33 and change line 37 to targetFile="${foldername}/${filename}.js"