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+====== Send Zulip notification on low disk space in Linux ======
+<code bash>
+#/bin/bash
+free_percent=$(df -h | grep /data | awk '{print $5}')
+free_percent_no=$(df -h | grep /data | awk '{print $5}' | sed 's/%//')
+free_no=$(df -h | grep /data | awk '{print $4}')
+FILE=/root/cron_diskspace_notification
+if [ "$free_percent_no" -gt "95" ]; then
+        if [[ ! -f "$FILE" ]]; then
+                curl -X POST https://chat.example.com.hr/api/v1/messages \
+                        -u name-bot@chat.example.com.hr:<key> \
+                        -d "type=stream" \
+                        -d "to=Infrastructure" \
+                        -d "subject=Disk space" \
+                        -d $"content=Disk usage is abowe 95%. Currently at $free_percent. Free space is: $free_no"
+                touch $FILE
+                datum=$( date +%F )
+                echo "$datum" > $FILE
+        else
+                datum=$( date +%F )
+                datumf=`cat $FILE`
+                if [ "$datum" != "$datumf" ]; then
+                        echo "$datum" > $FILE
+                        curl -X POST https://chat.example.com.hr/api/v1/messages \
+                                -u name-bot@chat.example.com.hr:<key> \
+                                -d "type=stream" \
+                                -d "to=Infrastructure" \
+                                -d "subject=Disk space" \
+                                -d $"content=Disk usage is abowe 95%. Currently at $free_percent. Free space is: $free_no"
+                fi
+        fi
+else
+        if [[ -f "$FILE" ]]; then
+                rm $FILE
+        fi
+fi
+</code>