#!/usr/bin/env perl 
use strict;
use warnings;
use feature 'say';

my $infile = shift;
open my $in, '<', $infile or die "Cannot open $infile: $!";
while (<$in>) {
	chomp;
	s/=\s*$/"= " . shift/e;
	say;
}
close $in;

##</code><code>##

$ ./bar.pl template.config list.txt file_list.txt
;; path to config file
$;INPUT_FILE$; = list.txt
;; path to list of config files
$;INPUT_FILE_LIST$; = file_list.txt
;; path to temporary directory
$;TEMP_DIR$; = $;TMP_DIR$;
;; use --v for verbose summary
$;OTHER_ARGS$; = --v

##</code><code>##

;; path to config file
$;INPUT_FILE$; =
;; path to list of config files
$;INPUT_FILE_LIST$; =
;; path to temporary directory
$;TEMP_DIR$; = $;TMP_DIR$;
;; use --v for verbose summary
$;OTHER_ARGS$; = --v