"12345/12345.jpg" みたいな形式の名前のファイルを、親ディレクトリに出してあげる。

move_images.sh

files="*"
for filepath in ${files}
do

if [ -e ${filepath}/${filepath}.jpg ]; then
  mv ${filepath}/${filepath}.jpg ${filepath}.jpg
  rm -rf ${filepath}
  echo "UPDATE wp_posts SET post_content=REPLACE(post_content,'${filepath}/${filepath}.jpg','${filepath}.jpg');" >> sql_replace.sql
  echo ${filepath}.jpg removed >> log.txt

else

  if [ -e ${filepath}/${filepath}.png ]; then
    mv ${filepath}/${filepath}.png ${filepath}.png
    rm -rf ${filepath}
  echo "UPDATE wp_posts SET post_content=REPLACE(post_content,'${filepath}/${filepath}.png','${filepath}.png');" >> sql_replace.sql
  echo ${filepath}.png removed >> log.txt
  else
    echo ${filepath} not removed >> log.txt
  fi
fi

done
read wait