bash file

#!/bin/bash
CPUtemp=$(cat /sys/class/thermal/thermal_zone0/temp)
echo "CPU temp=$CPUtemp'mC"
GPUtemp=$(/opt/vc/bin/vcgencmd measure_temp)
echo "GPU $GPUtemp"
echo "CPU freq=$(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq)"
echo "CPU maxf=$(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq)"
echo "GPU RAM $(/opt/vc/bin/vcgencmd get_config sdram_freq)"
echo "GPU Video core $(/opt/vc/bin/vcgencmd get_config core_freq)"
echo "GPU 3D core $(/opt/vc/bin/vcgencmd get_config gpu_freq)"

to steadily view run

watch -n1 file.bash