raspberryPi


Safe Mode
=Insert a physical jumper between pins 5 & 6 of GPIO header P1.  -OR-
=Append rescueshell to the argument list in the recovery.cmdline file which is found in the root NOOBS directory.
=boot into a basic busybox shell rather than launching the NOOBS GUI
[Disable GPIO false trigger]
-append disablesafemode to the argument list in the recovery.cmdline file which is found in the root NOOBS directory.

Recovery Mode
=Try pressing shift only when the grey splashscreen is displayed rather than holding it from boot up.
=Append gpiotriggerenable to the argument list in the recovery.cmdline file + connect GPIO pin 3 on header P1 to GND (pin 25).
=lets you enter the NOOBS interface to do the following:
 > Install selected operating systems onto your SD card.
 > Edit configuration files for an operating system.
 > Select the display language, keyboard layout, display mode (HDMI, composite etc.).
 > Exit NOOBS and reboot the Pi into the operating system boot menu.

Recovery Mode (Force entered, overrides GPIO or keyboard input)
=Append forcetrigger to the argument list in the recovery.cmdline file
=the Recovery Mode will be displayed every time you boot from your NOOBS card (until you edit recovery.cmdline again).

Raspberry Pi 3B+
= pin RUN (for CPU only) -> pull down GND ; RESET buttom
= pin PEN (board level ) -> pull down GND ; normal shutdown, go sleep

https://github.com/raspberrypi/noobs/blob/master/README.md
NOOBS (New Out of Box Software) - Document.

useradd timyou -m -p timothy
rasp-config > interface > ssh
login:pi - password: raspberry
sudo su -
apt-get update
apt-get install vim
update-alternatives --config editor

a.png


ip="$(ifconfig | grep -A 1 'wlan0' | grep -o 'inet [0-9\.]*' | cut -f 2 -d ' ')"
ro="$(netstat -rn | grep 'UG' | grep -o '0.0.0.0\s* [0-9\.]*' | cut -f 2 -d ' ')"

---

_IP=$(hostname -I) || true
if [ "$_IP" ]; then
  printf "My IP address is %s\n" "$_IP"
fi

_IP=$(/sbin/ip route | awk '/default/ { print $3 }')
if [ "$_IP" ]; then
  printf "The Default Gateway is %s\n" "$_IP"
fi

Labels: my.