sudomod

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Temperature Log - Sat  9 Jul 14:07:54 UTC 2016
40.6'C
43.3'C
44.4'C
46.5'C
47.1'C
47.6'C
50.3'C
50.3'C
50.8'C
51.4'C
51.9'C
51.9'C
54.1'C
53.0'C
55.1'C
56.2'C
55.1'C
56.2'C
57.8'C
56.2'C
57.8'C
57.8'C
56.8'C

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Setup temperature script at boot:
Note: do not copy the "#" from my commands. It is just an indicater for my notes only. You DO need it for the #!/bin/bash command, but the other ones in this doc do not copy. Just select the text after it. 
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1. SSH to raspberry pi

2. Created script: #sudo nano temperature_log.sh

3. Paste temeprature script to file you created. The logs get saved to /pi/home/logs/ directory of your pi:

#!/bin/bash

timestamp=`date +%F_%H-%M-%S`
echo "Temperature Log - $(date)" >/home/pi/logs/temperature_log_$timestamp.txt
while :
do
    temp=`/opt/vc/bin/vcgencmd measure_temp`
    temp=${temp:5:16}
    echo $temp >>/home/pi/logs/temperature_log_$timestamp.txt
    sleep 60
done

FYI: Changed sleep from 10 seconds to 60 seconds so it will log every 1 minute (or 60 seconds)

4. #CTRL+O
5. #Enter
6. #CTRL+X
7. Change permissions: #sudo chmod +x temperature_log.sh
8. Test the script: #./temperature_log.sh
FYI: I used WINSCP to check the temperature_log_$timestamp.txt to confirm it is writing every minute.
9. Enable script at startup: #sudo nano /etc/rc.local
10. Paste the following before "exit 0"
#( sleep 10; sudo bash /home/pi/temperature_log.sh ) &
11. #CTRL+O
12. #Enter
13. #CTRL+X
14. Reboot and confirm script is running and writing at startup: #sudo reboot


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