Find all zip files in current folder and subfolders and extract the contents in a folder with the zip file name.

munzip.sh

#!/bin/bash
  rootdir="$PWD"
  find "$rootdir" -type f -name '*.zip' | while read file;do    # find all .zip files in the directory
    cd "$(dirname "$file")"
    if [ "$(dirname "$file")" = "$PWD" ];then     # if the file found is in the same directory as defined "rootdir"
      mkdir "$(basename "$file" | cut -d. -f1)"
      cd "$(basename "$file" | cut -d. -f1)"
      unzip -O cp949 -n "$file"                            # unzip the file
      mv "$file" "$file".tododelete
    else
      echo "error"
      break
    fi
  done
  cd "$rootdir"