Create directories from filenames and move the files into those directories, based on file type.

rename_filetype.sh

read -p "Please enter a file type: " filetype
read -p "Please enter a directory: " filesdir

if [ -z $filetype ]
then
  echo "$filetype is empty. Please retry."
  exit 2
fi

if [ ! -d $filesdir ]
 then
 echo "$filesdir does not exist. Please retry with another directory."
 exit 2
fi

cd $filesdir
echo "Navigating to: $PWD " 
echo "Searching for .$filetype's in $filesdir"

set -o errexit -o nounset
for file in *.$filetype
do
    if [ -f "$file" ]; then
      dir="${file%.$filetype}"
      mkdir -- "$dir"
      mv -- "$file" "$dir"
    else
      echo "No .$filetype's found in this directory."
    fi
done

echo "Process complete. Files have been renamed and moved to their new directories."