$ vi my-pi-temp.sh
--------------------------------
$ cat my-pi-temp.sh
#!/bin/bash
# Script: my-pi-temp.sh
# Purpose: Display the ARM CPU and GPU temperature of Raspberry Pi 2/3
# Author: Vivek Gite <www.cyberciti.biz> under GPL v2.x+
# -------------------------------------------------------
cpu=$(</sys/class/thermal/thermal_zone0/temp)
echo "$(date) @ $(hostname)"
echo "-------------------------------------------"
#echo "GPU => $(/opt/vc/bin/vcgencmd measure_temp)"
#echo "GPU => $(vcgencmd measure_temp)"
echo "CPU => $((cpu/1000))'C"
--------------------------------
$ chmod +x my-pi-temp.sh
$ ./my-pi-temp.sh
Tue 11 Aug 15:32:33 CST 2020 @ raspberrypi
-------------------------------------------
GPU => temp=52.0'C
CPU => 52'C
--------------------------------
$ watch -n 1 -d ./my-pi-temp.sh
Every 1.0s: ./my-pi-temp.sh raspberrypi: Tue Aug 11 15:35:41 2020
Tue 11 Aug 15:35:41 CST 2020 @ raspberrypi
-------------------------------------------
GPU => temp=52.0'C
CPU => 52'C
--------------------------------
参考：