my %fileInfo = find(...);

sub wanted {
   ...
   $fileInfo{$fileName} = $fileName;
   return %fileInfo;
}

##</code><code>##

my %fileInfo;

find(...);

sub wanted {
   ...
   $fileInfo{$fileName} = $fileName;
}

##</code><code>##

my @fileNames;

find(...);

sub wanted {
   ...
   push @fileNames, $fileName;
}

##</code><code>##

my %fileInfo = func();

sub func {
   ...put stuff in %fileInfo...
   return %fileInfo;
}

##</code><code>##

my %fileInfo = func();

sub func {
   my %fileInfo;      # Work with a local variable.
   ...put stuff in %fileInfo...
   return %fileInfo;  # Return the local variable.
}

##</code><code>##

my %fileInfo;

func();

sub func {
   # Work with a global variable.
   ...put stuff in %fileInfo...
}