Quick, ugly, efficient bash script for templating files - takes everything ending with .template and replaces env vars inside them

template.sh

#!/bin/bash

for tmpl in $(find . | grep '\.template'); do
    targetFile=${tmpl%.*}
    echo "Templating ${tmpl} to ${targetFile}..."
    perl -pe 's;(\\*)(\$([a-zA-Z_][a-zA-Z_0-9]*)|\$\{([a-zA-Z_][a-zA-Z_0-9]*)\})?;substr($1,0,int(length($1)/2)).($2&&length($1)%2?$2:$ENV{$3||$4});eg' $tmpl > $targetFile
done