Marks system navigation

gistfile1.txt

    export MARKPATH=$HOME/.marks
    function jump {
        cd $MARKPATH/$1 2> /dev/null || echo "No such mark: $1"
    }
    function mark {
        mkdir -p $MARKPATH; ln -s $(pwd) $MARKPATH/$1
    }
    function unmark {
        rm -i $MARKPATH/$1
    }
    function marks {
        ls -l $MARKPATH | sed 's/  / /g' | cut -d' ' -f9- && echo
    }

  function _jump {
      local cur=${COMP_WORDS[COMP_CWORD]}
      local marks=$(find $MARKPATH -type l -printf "%f\n")
      COMPREPLY=($(compgen -W '${marks[@]}' -- "$cur"))
      return 0
  }
  complete -o default -o nospace -F _jump jump

From https://news.ycombinator.com/item?id=6229001