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cdh.sh

declare -a DIRS

savedir() {
  local i
  for ((i=1;i<=9;i++)); do 
    test "$1" = "${DIRS[$i]}" && return
  done
  for ((i=9;i>1;i--)); do 
    DIRS[$i]="${DIRS[((i-1))]}"
  done
  DIRS[1]="$1"
}

showdirs() {
  local i=1
  while [ "${DIRS[$i]}" ]; do
    echo "$i: ${DIRS[$i]}"
    ((i++))
  done
}

gotodir() {
  local d
  showdirs
  printf "goto: "
  read -n 1 d
  echo
  cd "${DIRS[$d]}"
}

PROMPT_COMMAND=prompt_command
prompt_command() { savedir "$OLDPWD"; }

alias cdh=gotodir