#232 Add the switch that allows you not to buffer the data.

[Riccardo La Marca]

I am going to show the percentage of completion of the file transfer, only since the buffer is active, that percentage will reach 100%, in my case, over 15 minutes before the files are actually written to disk. The size of my archive is over 4GB.
I need a switch that allows me to write files directly to disk, without going through the buffer.

7z x "$device" -o"$mountpoint" -bsp2 > /dev/null