View source for Merge template file in bash

I wanted to substitute some parameters in an xml file prior to feeding it to a Java program.  The following one liner works in bash.  In invokes a perl one liner using [http://tldp.org/LDP/abs/html/process-sub.html process substitution] and uses perl to parse in a property file with '=' delimiters.  All '''${}''' are substituted, and any missing params cause an error to be thrown.

<geshi lang="bash">
      java -xmlconfig <(perl -pne 'BEGIN { open my $fh, $ENV{SERVER_PROPERTIES_FILE} or die $!; \
 %hash = map { chomp; split /=/ } <$fh>; } s/\${(.*)}/$hash{$1} or die "missing $1"/eg' < "${SERVER_XML_FILE}" ) 
</geshi>

[[Category:Perl]]
[[Category:Bash]]