Move files into their own directories, using filenames without extensions.

gistfile1.sh

# Credit should go to http://stackoverflow.com/a/12607951/1563507

# Move files into their own directories, using filenames without extensions.
die() { echo "$*" >&2; exit 1; }
for file in *.md; do  # `md` used as example of filtering files one wants to move
  dir=${file%.md}
  test -d $dir || mkdir $dir  # or just mkdir -p $dir
  test -f $dir && die "$dir exists and is a file!"
  mv $file $dir
done

# Do something with each directory.
for dir in *; do ...; done