my 1st bash

rename.sh

#!/bin/bash

match="large"

for i in ./cover/*/*; do
  folder=$(dirname $i)
  fname=$(basename $i)
  if [[ "$fname" == *$match* ]]; then
    #tgt=$(echo $i | sed -e "s/$re_match/$replace/")
    mv "$i" "$folder/large_cover.jpg"
  else
    mv "$i" "$folder/cover.jpg"
  fi
done