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  1. or download this
    print <<'END';
\documentclass{article}
...
\usepackage{fullpage}
\begin{document}
END
  2. or download this
    sub substitute_vars {
  my ($template, $hash) = @_;
  (my $out = $template) =~ s/\${([^}]+)}/$$hash{$1}/ge;
  $out;
}
  3. or download this
    my $template = <<'TEMPLATE_END';
\section{${imfile}}
...
  chomp;
  print substitute_vars($template, { imfile => $_ } );
}
  4. or download this
    \newcommand{\insert_figures}[1]{
\section{#1}
...
...
\newpage
}