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my %fileInfo = find(...);

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

my %fileInfo;

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

my @fileNames;

...
   ...
   push @fileNames, $fileName;
}

my %fileInfo = func();

...
   ...put stuff in %fileInfo...
   return %fileInfo;
}

my %fileInfo = func();

...
   ...put stuff in %fileInfo...
   return %fileInfo;  # Return the local variable.
}

my %fileInfo;

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