Ubuntu 指令 安全移除usb碟

http://manpages.ubuntu.com/manpages/oneiric/man1/udisks.1.html

看一堆文章  想查出有沒有內建的指令可以取代nautilus內的 [Safely Remove Drive] 按鈕

就是找不到!!!

基本的是umount, eject, unbind或是remove
但都沒有像 [Safely Remove Drive] 那樣連帶把電關掉
echo '4-1' |sudo tee /sys/bus/usb/drivers/usb/bind
echo '4-1' |sudo tee /sys/bus/usb/drivers/usb/unbind

最後還是根據論壇去安裝了 udisks

udisks --detach /dev/sdb

看起來一樣了.....  還是不爽

http://pintant.cat/2012/05/12/power-off-usb-device/

I asked on the linux-usb mailing list (question, see one of the relevant answers (from Alan Stern). In short: not possible. When using a USB hub it’s then maybe possible -some models only-. The answer includes a link to a small program to try to disable the port. I could disable the port, but the device had still power.

http://askubuntu.com/questions/532586/what-is-the-command-line-equivalent-of-safely-remove-drive