Shell mark and jump to directories

.bashrc

export MARKPATH=$HOME/.marks
function jump {
	cd -P "$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- | sed 's/ -/\t-/g' && echo
}