create Thunderbird userChrome.css

#!/bin/bash
runDateTime=$(date '+%Y-%m-%d_%H-%M-%S')
# Hopefully there isn't more than one .default document.
cd /Users/${USER}/Library/Thunderbird/Profiles/
declare -i fileCount
fileCount=$(ls -d *.default | wc -l)
echo "fileCount=${fileCount}"

cd *.default
# ensure directory exists
mkdir chrome
cd chrome
pwd
# backup current file if it exists
mv userChrome.css userChrome${runDateTime}.css
cat <<___ >userChrome.css
/*
 * Do not remove the @namespace line -- it's required for correct functioning
 */
@namespace url("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"); /* set default namespace to XUL */

/*
 * Make all the default font sizes ...pt:
 */
* { font-size: 12pt !important; }
___

pwd
ls -l
cat userChrome.css