Add Raspberry Pi commands back to Pi page

src/pi.md

@@ -1,2 +1,105 @@
 # Raspberry Pi Commands
-This content has been moved to https://strivinglife.gitlab.io/book-raspberry-pi/.
+> Note to self: Information about Pis I own can be found at [https://strivinglife.gitlab.io/book-raspberry-pi/](https://strivinglife.gitlab.io/book-raspberry-pi/).
+
+## Current Uptime
+```bash
+uptime
+```
+
+## Restarting
+```bash
+sudo reboot
+```
+
+## Shutdown
+```bash
+sudo shutdown -h now
+```
+
+## Internet Configuration
+```bash
+ifconfig
+
+# Try to bring a network interface up.
+sudo ifup wlan0
+```
+
+## Samba
+```bash
+# Restart Samba services.
+sudo /etc/init.d/samba restart
+
+# Backup copy of Samba configuration.
+sudo cp /etc/samba/smb.conf /etc/samba/smb.conf.old
+# Edit Samba configuration. Restart (see above) for changes to be picked up.
+sudo nano /etc/samba/smb.conf
+
+# Check Samba services.
+systemctl status smbd
+```
+
+## SSH
+```bash
+# Check SSH service status.
+systemctl status sshd
+
+# SSH into a server with Raspberry Pi's default user.
+# Enter `exit` and press enter to quit the session.
+ssh pi@<ip_address>
+```
+
+## Terminal
+```bash
+# View past commands.
+history
+
+# View process information
+top
+```
+
+## Drive Information
+```bash
+# List device information.
+sudo fdisk -l
+
+# List mounts.
+sudo mount -l
+
+# Example: cd into a mounted USB device.
+cd /media/usbhdd1
+```
+
+## USB/Port Information
+```bash
+# Basic list of each port.
+lsusb
+# Lists out each port, with Product if there's a connected device.
+usb-devices
+```
+
+## Display Information
+```bash
+# List information about the connected display.
+tvservice -s
+```
+
+## Hardware Information
+See https://elinux.org/RPi_HardwareHistory#Board_Revision_History for more information.
+```bash
+# Includes Hardware and Revision information.
+cat /proc/cpuinfo
+```
+
+## OS Information
+```bash
+cat /etc/os-release
+```
+
+## RetroPie audio issues
+1. Make sure the correct audio output device is selected in the RetroPie configuration.
+2. `sudo nano /boot/config.txt` and uncomment `#hdmi_drive=2`. <kbd>ctrl+o</kbd>, <kbd>enter</kbd>, <kbd>ctrl+x</kbd>, `sudo reboot`.
+
+## Start GUI
+```bash
+startx
+```