Unzip all zip files in a directory and remove unzipped file if a file with the same md5checksum already unzipped

unzip_rm_zip_md5_sum_rm_dups.sh

#!/bin/bash
declare -A arr
for zip_file in *.zip; do
  unzip -q $zip_file && rm $zip_file
  file=${zip_file%.zip}
  read cksm _ < <(md5sum "$file")
  if ((arr[$cksm]++)); then 
    echo "rm $file"
    rm $file
  fi
done