Disregard the xbin are you using autorom
If you simply can't get it in recovery their are two options Rom manager and terminal but is you pushed tthe parted to your xbin while mounted then ran the script again you should work. Stupid question but are you in an adb shell while doing this
Is the phone plugged in and did you get the MOTO drivers
Download the drivers from here and unzipped them
How To: Set Up ADB/USB Drivers for Android Devices | The Unlockr
Let me know if that fixes your shell issues