dug: cd to bottom of directory tree (if you have several singly nested folders)

dug.sh

function dug() {
   ls -d */ >/dev/null 2>&1;
   if [[ $? -eq 0 && `ls -d */ | wc -l` -eq 1 ]];
   then
      builtin cd `ls -d */`;
      dig;
   fi
}