Simple content generator from a template file and variables. Replace variables on a file with bash. I use it for an html email template.

template.sh

#!/bin/bash

template_path="$1"

function usage (){
        echo -e "Usage: template <path to template> 'var1|content' 'var2|content'...";
        [[ -f "$template_path" ]] && { echo "Current variables:" $(cat $template_path |perl -ne '/#([A-Za-z1-9]+)#[^#].*/ && printf "%s, ", $1'); }
        exit 1;
}

if [[ -f "$template_path" ]]; then
        template=$(cat "$1")
        shift
        [ $# -eq 0 ] && usage
        for param in "$@"; do
                varName=$(echo $param | cut -d"|" -f1)
                varContent=$(echo $param | cut -d"|" -f2)
                template=$(echo $template | perl -pi -e "s!#$varName#!$varContent!g" );
        done
else
        clear
        echo "The template file doesn't exists!"
        usage
fi

echo $template

Display template file variables

template ~/path/to/your/template/file.html

Replace variables and output text (in your template: #MYVAR1#)

template ~/path/to/yout/template/file.html 'MYVAR1|variable one content' 'MYVAR2|variable two content'