OS X: Change directory in Terminal, Sync folder in Finder window.

sd.sh

# change directory and sync Finder window
sd () {
    # change terminal directory
    cd "$@" || return
    # sync Finder window or open new one if not exists
    osascript -e "tell application \"Finder\"
        if front Finder window exists then
            set target of front Finder window to (""\"$PWD\""" as POSIX file)
        else
            open (""\"$PWD\""" as POSIX file)
        end if
    end tell" > /dev/null
}