Bash script to go back up to any dir in path

up.sh

# A very useful (and very much used) bash script I found recently to go back up to any dir in the current path.  Supports autocomplete also which is awesome.

# go back up to a directory - https://unix.stackexchange.com/questions/14303/bash-cd-up-until-in-certain-folder
function up()
{
    if [ -z "$1" ]; then
        return
    fi
    local upto=$1
    cd "${PWD/\/$upto\/*//$upto}"
}

# command line autocomplete
function _up()
{
    local cur=${COMP_WORDS[COMP_CWORD]}
    local d=${PWD//\//\ }
    COMPREPLY=( $( compgen -W "$d" -- "$cur" ) )
}
complete -F _up up