Add shutdown timeout. Update README.md

gphoto-backup.sh

@@ -5,11 +5,15 @@
 # to install the required packages and configure the system.
 
 # Specify a storage device and its mount point
-HOME_DIR="/home/pi"
+HOME_DIR="/home/pi" # Home directory path
+SHUTD="5" # Minutes to wait before shutdown due to inactivity
 
 # Set the ACT LED to heartbeat
 sudo sh -c "echo heartbeat > /sys/class/leds/led0/trigger"
 
+# Shutdown after a specified period of time (in minutes) if no device is connected.
+sudo shutdown -h $SHUTD "Shutdown is activated. To cancel: sudo shutdown -c"
+
 # Wait for camera
 DEVICE=$(gphoto2 --auto-detect | grep usb | cut -b 36-42 | sed 's/,/\//')
 while [ -z ${DEVICE} ]
@@ -18,6 +22,9 @@ while [ -z ${DEVICE} ]
 	DEVICE=$(gphoto2 --auto-detect | grep usb | cut -b 36-42 | sed 's/,/\//')
 done
 
+# Cancel shutdown
+sudo shutdown -c
+
 # Obtain camera model
 # Create the target directory with the camera model as its name
 CAMERA=$(gphoto2 --summary | grep "Model" | cut -d: -f2 | tr -d '[:space:]')