I have seen a number of tutorials on using GPIO P6 to work as a power switch. Is this safe? Does this approach do a "safe shutdown" -
sudo shutdown -h now?
From a tutorial:
For this hack, we will use the two-pin P6 header.
What you need: 1x Raspberry Pi Model B Rev.2 1x 2-pole momentary pushbutton switch
For this system, simply solder the two poles of the switch to the two pins of P6. Or, for a "remote" switch, attach two wires to P6 and then connect the switch to those wires.
To reset the RPi while it's on: hold the pushbutton down for about a second. To wake the RPi from halt state: press the pushbutton down until the ACT light turns on.