Decompress a gzip file without gz extension

script.sh

gzip -d "" -f gzippe_file

#For several files under several directories
for item in $(ls -d -1 $PWD/**/*); do 
  echo $item; zcat $item > temp;
  sed -i 's/, / /g' temp;
  gzip temp;
  mv temp.gz $item;
done;