Terminal.app: escape codes for working directory and document?

Does anyone know what the escape sequences are to show "working directory" and "document" in Mac OSX Terminal.app? I'm trying the method to urlencode a URL and it's not working with zsh. I have a graphic of the dialog in Preferences below. So far, I've only been able to get the following working which allows a drop down to the current path on the left of the top bar: _PWD=$(echo $PWD| sed "s;$HOME;~;") __SHELL="zsh" printf "\033]0;$USER@$HOSTNAME '${_PWD}' ${__SHELL}\007" I'm not sure why above works, however if I remove the escape code the drop down isn't displayed anymore. I tried the following per the directions to percent "urlencode" a URL to a file, but it's not working: PWD_URL="$(urlencode file:$PWD)" printf "\033]6;%s\007" ${PWD_URL} printf "\033]7;%s\007" ${PWD_URL} urlencode () { string=$1 while [ -n "$string" ]; do tail=${string#?} head=${string%$tail} case $head in [-._~0-9A-Za-z]) printf %c "$head";; *) printf %%%02x "'$head" esac string=$tail done echo } I have "Working directory or document" and "Path" enabled above escape sequences. ref: my copyright fair use Here's an example of output from "urlencode" I'm passing in the escape sequence: \033]7;file%3a%2f%2flocalhost%2f%2fUsers%2fusername\007