Add shell script to warn notify if storage is near full

shell/scripts/diskUsageAlert.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# user declaired variables
+DISK=
+API_KEY=
+DOMAIN=
+PRIO=1
+TITLE="La Noscea Disk Usage"
+THRESHOLD_SIZE=20
+THRESHOLD_UNIT=G
+
+# DON'T TOUCH THIS!!!!
+declare -A POWER_OF=( ["K"]=0 ["M"]=1 ["G"]=2 ["T"]=3 )
+THRESHOLD_IN_K=$(($THRESHOLD_SIZE*1024**${POWER_OF[$THRESHOLD_UNIT]}))
+echo $THRESHOLD_IN_K
+
+USAGE=$(df $DISK --output=avail | tail -1 | tr -d ' ' | tr -d '\n' | tr -d '\t' | tr -d '\r')
+echo $USAGE
+if [ "$USAGE" -lt "$THRESHOLD_IN_K" ]; then
+    curl --request POST --url "https://$DOMAIN/message" --header 'Content-Type: application/json' --header "X-Gotify-Key: $API_KEY" --data "{\"message\": \"Under $THRESHOLD_SIZE $THRESHOLD_UNIT free!!!\",\"priority\": $PRIO,\"title\": \"$TITLE\"}"
+else
+    echo "higher"
+fi