Measure Raspberry Pi CPU / GPU / Core / SD clock speeds and check whether you are undervolted

measurepi.sh

#!/bin/bash
# This bash script outputs the status of your Pi and checks whether you are being throttled for undervoltage and gives you your temperature
# Article and discussion at https://jamesachambers.com/measure-raspberry-pi-undervoltage-true-clock-speeds/
# Author James A Chambers 6-6-17

# Output current configuration
vcgencmd get_config int | egrep "(arm|core|gpu|sdram)_freq|over_volt"

# Measure clock speeds
for src in arm core h264 isp v3d; do echo -e "$src:\t$(vcgencmd measure_clock $src)"; done

# Measure Volts
for id in core sdram_c sdram_i sdram_p ; do echo -e "$id:\t$(vcgencmd measure_volts $id)"; done

# Measure Temperature
vcgencmd measure_temp

# See if we are being throttled
throttled="$(vcgencmd get_throttled)"
echo -e "$throttled"
if [[ $throttled != "throttled=0x0" ]]; then
    echo "WARNING:  You are being throttled.  This is likely because you are undervoltage.  Please connect your PI to a better power supply!"
fi

Useful script! I had to add the path to vcgencmd (/opt/vc/bin/) for it to work on my systems. Thanks for the great work.

Thanks for the useful script! I noticed it's reporting potential undervoltage for me, but I found some updated information about my throttling being due to temperature limits reached. I've updated your script with more reason codes. Feel free to incorporate them or use them however you like!
https://gist.github.com/tmuka/3b1c74934e67dd046df6f43aa25711ce