I often forget what I have to change in transfering such code from one site to another so I have an "export" script which takes in templated code and substitutes the variables with site-specific values based on a config. It saves me time and mistakes and satisfies my natural aversion to masochism.

In your case, for example, one could use Template::Toolkit. The templated cgi input file (ABC.in) would be like:

#![% SHEBANG ]
# eventually file ABC.cgi
use [% LOCATION_OF_VARIABLES_CGI_FILE ];
...
[download]

And this script (verbatim copy from the doc) does the substitutions:

# WARNING: simplistic work flow for demo purposes

# create Template object
my $template = Template->new({
  INCLUDE_PATH => '/search/path',
  # ...
});
 
# define template variables for replacement
my $vars_for_windows = {
    # whatever a windows path looks like
    SHEBANG => '#!\...\straw...\perl.exe',
    LOCATION_OF_VARIABLES_CGI_FILE => 'c:\abc\xyz\variables.cgi',
};
my $vars_for_linux = {
    SHEBANG => '#!/usr/bin/perl',
    LOCATION_OF_VARIABLES_CGI_FILE => '/usr/xyy/abc/variables.cgi',
};
 
# specify input filename, or file handle, text reference, etc.
my $input = 'ABC.in';
if( $target_is_windows ){
  # process input template, substituting variables, final output filen
+ame
  $template->process($input, $vars_for_windows, 'ABC.cgi')
    || die $template->error();
} else {
  $template->process($input, $vars_for_linux, 'ABC.cgi')
    || die $template->error();
}
print "$0: do you want me to ftp it to remote site?...\n"
[download]

bw, bliako

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