Bash shell script to print stats about a Raspberry running pihole

pi.status.sh

#!/bin/bash

# Define colors
RED='\033[91m'
RED_solid='\033[101m'
GREEN='\033[92m'
GREEN_solid='\033[42m'
CYAN='\033[96m'
NC='\033[0m'
BLUE_solid='\e[44m'

# Gather system details.

dt=$(date -R)
up=$(uptime)
gov=$(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor)
freq=$(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq)
freq=$((freq/1000))
usedRAM=$(free | awk '/Mem/{printf("%.2f\n"), $3/1024}')
freeRAM=$(free | awk '/Mem/{printf("%.2f\n"), $4/1024}')
cacheRAM=$(free | awk '/Mem/{printf("%.2f\n"), $6/1024}')
# temp=$(cat /sys/class/thermal/thermal_zone0/temp) ; temp=$((temp/1000))

# measurements via vcgencmd, might require sudo access 
volts=$(sudo /opt/vc/bin/vcgencmd measure_volts core | cut -d'=' -f 2)
temp=$(/opt/vc/bin/vcgencmd measure_temp | cut -d'=' -f 2 | cut -d"'" -f 1) 
temp_check=$(printf %.0f $temp); temp_check=$((temp_check)); declare -i temp_check

# Print System details
echo -e "\n${GREEN_solid}$dt${NC}"
echo -e "\n${BLUE_solid}CPU${NC}"
echo -e "System voltage = $volts"
if ((temp_check >= 10 && temp_check <= 37)); then
  echo -e "CPU temp=${GREEN}$temp°C${NC}"
fi
if ((temp_check > 37)); then
  echo -e "CPU temp=${RED}$temp°C${NC}"
fi
if ((temp_check < 10)); then
  echo -e "CPU temp=${CYAN}$temp°C${NC}"
fi

if [ "$gov" == "powersave" ]; then
	echo -e "CPU Governor=${GREEN}$gov${NC}"
fi
if [ "$gov" == "conservative" ]; then
	echo -e "CPU Governor=${CYAN}$gov${NC}"
fi
if [ "$gov" == "performance" ] | [ "$gov" == "ondemand" ]; then
	echo -e "CPU Governor=${RED}$gov${NC}"
fi
if [ "$freq" == "700" ]; then
	echo -e "Current speed=${GREEN}$freq MHz${NC}"
fi
if [ "$freq" == "1000" ]; then
	echo -e "Current speed=${RED}$freq MHz${NC}"
fi

# Print free & used RAM

echo -e "\n${BLUE_solid}RAM${NC}"
echo -e "Free=${GREEN}$freeRAM MB${NC} ; Used=${RED}$usedRAM MB${NC}; Cache=${CYAN}$cacheRAM MB${NC}"

# print pihole status directly from pihole CLI
echo -e "\n${BLUE_solid}Pihole${NC}"
pihole status

# Check system status. 
# Requires package dnsutils on linux.
echo -e "\n\n${BLUE_solid}Checking DNS resolution${NC}"
dig google.com +noall +stats +answer

# print system uptime
echo -e "${RED_solid} $up ${NC}"


# Potential alternatives
# temp=$(/opt/vc/bin/vcgencmd measure_temp | egrep -o '[0-9]*\.[0-9]*')
# freq=$(/opt/vc/bin/vcgencmd measure_clock arm | cut -d'=' -f 2) # in MHz
# freq=$((freq/1000000))


# Troubleshooting:
# if you get the error "VCHI initialization failed"
# on running the above commands via vcgencmd, then you need
# to add your default "unprivilaged" user to the group 'video'
# Run:
# sudo usermod -G video piuser