add linux server stats script

lib/server_stats.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+# install necessary files:
+# sudo apt-get install bc
+
+# make this file executable:
+# chmod +x server_stats.sh
+
+# add to crontab (command: crontab -e)
+# * * * * * /path/to/server_stats.sh
+
+# thingspeak api key for channel that data will be logged to
+api_key='XXXXXXXXXXXXXXXX'
+
+# get cpu usage as a percent
+used_cpu_percent=`top -b -n2 -p 1 | fgrep "Cpu(s)" | tail -1 \
+| tr -s ' ' | cut -f2 -d' ' | cut -f1 -d'%'`
+echo $used_cpu_percent
+
+# get memory
+used_mem=`free -m | tr -s ' ' | grep buffers/cache | cut -f3 -d' '`
+total_mem=`free -m | tr -s ' ' | grep Mem | cut -f2 -d' '`
+used_mem_percent=`echo "scale=2;100*$used_mem/$total_mem" | bc`
+echo $used_mem_percent
+
+# get disk use as a percent
+used_disk_percent=`df -lh | awk '{if ($6 == "/") { print $5 }}' \
+| head -1 | cut -d'%' -f1`
+echo $used_disk_percent
+
+# post the data to thingspeak
+curl -k --data \
+"api_key=$api_key&field1=$used_cpu_percent&field2=$used_mem_\
+percent&field3=$used_disk_percent" https://api.thingspeak.com/update
+