bulkrename

#!/bin/bash
# replace spaces with underscores, delete puncutation, 
# change upper to lower case, remove extra underscores

find "$1" -depth | while read line; do
  dir="$(dirname "$line")"
  old="$(basename "$line")"
  new="$(echo $old | tr ' ' '_' \
      | tr -d '()[]{},?!' | tr -d "'" \
      | tr '[[:upper:]]' '[[:lower:]]' \
      | sed 's/__/_/g' | sed 's/_-_/-/g' )"
  [[ "$old" != "$new" ]] && mv -iv "$dir/$old" "$dir/$new"
done