A cd replacement which goes up many levels

# ======================================================================
# A replacement for the built-in cd command which understands multiple
# dots. For example:
#
#     cd ...    # Up 2 levels
#     cd ....   # Up 3 levels
#     cd .....  # Up 4 levels
# ======================================================================
function cd() {
    if [[ "$1" =~ ^\.\.\.+$ ]]
    then
        # Case: The argument contains 3 or more dots and no other chars

        local levels=${1/./}  # How many levels to go up
        local destination=.   # The final destination

        # Each time we go through the loop, we go up one level and
        # remove one dot from levels
        while [[ -n $levels ]]
        do
            destination=$destination/..
            levels=${levels/./}
        done

        cd $destination
    else
        # If the argument does not contain 3 or more dots, we will treat
        # it as a regular case
        builtin cd "$@"
    fi

    ls  # Nice to have
}