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#!/usr/bin/env perl

...
my $master_conf = $opts{conf};

say $master_conf;

$ pm_getopt_var.pl --conf conf_value
conf_value

$master_conf = $opts->{conf};

my $json_data = extract_json("$master_conf");

# shebang and use <whatever> lines here

...
# do something with $decoded_json_obj here

# subroutine definitions here