alphabetize-files-into-folders

#/bin/bash
shopt -s nocaseglob
for x in {a..z}
do
  echo "$x"
  mkdir -p "$x"
  find . -maxdepth 1 -type f -iname "${x}*" -exec mv -i {} "$x/" \;
done
rmdir {a..z}/ #clean up #may destroy any other single-letter empty dirs. Uh, seems like an acceptable edge case