motd based on armbian's 10-armbian-header and 30-armbian-sysinfo, providing a helpful diagnostic for the server.

10-server-motd

#!/bin/bash
#
# Copyright (c) Authors: https://www.armbian.com/authors
#
# This file is licensed under the terms of the GNU General Public
# License version 2. This program is licensed "as is" without any
# warranty of any kind, whether express or implied.

# DO NOT EDIT THIS FILE but add config options to /etc/default/armbian-motd
# any changes will be lost on board support package update

THIS_SCRIPT="header"
MOTD_DISABLE=""

. /etc/os-release

for f in $MOTD_DISABLE; do
	[[ $f == $THIS_SCRIPT ]] && exit 0
done


KERNELID=$(uname -r)

# Odroid N2 exception
[[ -f /proc/device-tree/model ]] && [[ -n $(tr -d '\000' < /proc/device-tree/model | grep ODROID | grep Plus) ]] && BOARD_NAME+="+"

TERM=linux toilet -f standard -F metal $(echo $BOARD_NAME | sed 's/Orange Pi/OPi/' | sed 's/NanoPi/NPi/' | sed 's/Banana Pi/BPi/')
echo -e "Welcome to \e[0;91mDebian ${VERSION}\x1B[0m with $([[ $BRANCH == edge ]] && echo -e "\e[0;91mbleeding\x1B[0m edge " )\e[0;91mLinux $KERNELID\x1B[0m"

# displaying status warnings

if [[ "$IMAGE_TYPE" != "stable" ]]; then
	[[ "$IMAGE_TYPE" == "user-built" ]] && UNSUPPORTED_TEXT="built from trunk"
	[[ "$IMAGE_TYPE" == "nightly" ]] && UNSUPPORTED_TEXT="untested automated build"
else
	[[ "$BOARD_TYPE" == "csc" || "$BOARD_TYPE" == "tvb" ]] && UNSUPPORTED_TEXT="community creations"
	[[ "$BOARD_TYPE" == "wip" ]] && UNSUPPORTED_TEXT="work in progress"
	[[ "$BOARD_TYPE" == "eos" ]] && UNSUPPORTED_TEXT="end of life"
fi

if [[ -n $DISTRIBUTION_STATUS && $DISTRIBUTION_STATUS != supported ]]; then
	[[ -n $UNSUPPORTED_TEXT ]] && UNSUPPORTED_TEXT+=" & "
	UNSUPPORTED_TEXT+="unsupported ($DISTRIBUTION_CODENAME) userspace!"
fi

if [[ -n $UNSUPPORTED_TEXT ]]; then
	echo -e "\e[0;91mNo end-user support: \x1B[0m$UNSUPPORTED_TEXT\n"
fi
#!/bin/bash
#
# Copyright (c) Authors: https://www.armbian.com/authors
#
# This file is licensed under the terms of the GNU General Public
# License version 2. This program is licensed "as is" without any
# warranty of any kind, whether express or implied.
#

# DO NOT EDIT THIS FILE but add config options to /etc/default/armbian-motd
# generate system information

export PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
THIS_SCRIPT="sysinfo"

# don't change default values - they are lost on upgrades. Use /etc/default/armbian-motd for your values

MOTD_DISABLE=""
PRIMARY_INTERFACE="eth0"
PRIMARY_DIRECTION="rx"
STORAGE=/dev/sda1
HIDE_IP_PATTERN="^dummy0|^lo"
CPU_TEMP_LIMIT=60
# Temperature offset in Celcius degrees
CPU_TEMP_OFFSET=0
HDD_TEMP_LIMIT=60
AMB_TEMP_LIMIT=40

[[ -f /etc/default/armbian-motd ]] && . /etc/default/armbian-motd

for f in $MOTD_DISABLE; do
	[[ $f == $THIS_SCRIPT ]] && exit 0
done

# don't edit below here

# Include functions:
# getboardtemp()
# batteryinfo()
# ambienttemp()
source /usr/lib/armbian/armbian-allwinner-battery

function display() {
	# $1=name $2=value $3=red_limit $4=minimal_show_limit $5=unit $6=after $7=acs/desc{
	# battery red color is opposite, lower number
	if [[ "$1" == "Battery" ]]; then local great="<"; else local great=">"; fi
	if [[ -n "$2" && "$2" -gt "0" && (( "${2%.*}" -ge "$4" )) ]]; then
		printf "%-14s" "$1:"
		if awk "BEGIN{exit ! ($2 $great $3)}"; then echo -ne "\e[0;91m $2"; else echo -ne "\e[0;92m $2"; fi
		printf "%-1s\x1B[0m" "$5"
		printf "%-11s\t" "$6"
		return 1
	fi
} # display

function get_ip_addresses() {
	local ips=()
	for f in /sys/class/net/*; do
		local intf=$(basename $f)
		# match only interface names "dummy0" and "lo"
		if [[ $intf =~ $HIDE_IP_PATTERN ]]; then
			continue
		else
			local tmp=$(ip -4 addr show dev $intf | grep -v "$intf:avahi" | awk '/inet/ {print $2}' | cut -d'/' -f1 | uniq)
			# add both name and IP - can be informative but becomes ugly with long persistent/predictable device names
			#[[ -n $tmp ]] && ips+=("$intf: $tmp")
			# add IP only
			[[ -n $tmp ]] && ips+=("$tmp")
		fi
	done
	echo "${ips[@]}"
} # get_ip_addresses

function storage_info() {
	# storage info
	RootInfo=$(df -h /)
	root_usage=$(awk '/\// {print $(NF-1)}' <<<${RootInfo} | sed 's/%//g')
	root_total=$(awk '/\// {print $(NF-4)}' <<<${RootInfo})
	StorageInfo=$(df -h $STORAGE 2>/dev/null | grep $STORAGE)
	if [[ -n "${StorageInfo}" && ${RootInfo} != *$STORAGE* ]]; then
		storage_usage=$(awk '/\// {print $(NF-1)}' <<<${StorageInfo} | sed 's/%//g')
		storage_total=$(awk '/\// {print $(NF-4)}' <<<${StorageInfo})
		if [[ -n "$(command -v smartctl)" ]]; then
			DISK="${STORAGE::-1}"
			storage_temp+=$(smartctl -l scttempsts $DISK 2> /dev/null | grep -i 'Current Temperature:' | awk '{print $(NF-1)}')
		fi
	fi
} # storage_info

# query various systems and send some stuff to the background for overall faster execution.
# Works only with ambienttemp and batteryinfo since A20 is slow enough :)
amb_temp=$(ambienttemp &)
ip_address=$(get_ip_addresses &)
batteryinfo
storage_info
getboardtemp
critical_load=80

# get uptime, logged in users and load in one take
UPTIME=$(LC_ALL=C uptime)
UPT1=${UPTIME#*'up '}
UPT2=${UPT1%'user'*}
users=${UPT2//*','}
users=${users//' '}
time=${UPT2%','*}
time=${time//','}
time=$(echo $time | xargs)
load=${UPTIME#*'load average: '}
load=${load//','}
load=$(echo $load | cut -d" " -f1)
[[ $load == 0.0* ]] && load=0.10
cpucount=$(grep -c processor /proc/cpuinfo)

load=$(awk '{printf("%.0f",($1/$2) * 100)}' <<< "$load $cpucount")

# memory and swap
mem_info=$(LC_ALL=C free -w 2>/dev/null | grep "^Mem" || LC_ALL=C free | grep "^Mem")
memory_usage=$(awk '{printf("%.0f",(($2-($4+$6+$7))/$2) * 100)}' <<<${mem_info})
mem_info=$(echo $mem_info | awk '{print $2}')
memory_total=$(( mem_info / 1024 ))
swap_info=$(LC_ALL=C free -m | grep "^Swap")
swap_usage=$( (awk '/Swap/ { printf("%3.0f", $3/$2*100) }' <<<${swap_info} 2>/dev/null || echo 0) | tr -c -d '[:digit:]')
swap_total=$(awk '{print $(2)}' <<<${swap_info})

# display info
display "System load" "${load%% *}" "${critical_load}" "0" "%" ""

printf "Up time:       \x1B[92m%s\x1B[0m\t" "$time"
display "Local users" "${users##* }" "3" "2" ""
echo "" # fixed newline
if [[ ${memory_total} -gt 1000 ]]; then
	memory_total=$(awk '{printf("%.2f",$1/1024)}' <<<${memory_total})"G"
else
	memory_total+="M"
fi

if [[ ${swap_total} -gt 500 ]]; then
	swap_total=$(awk '{printf("%.2f",$1/1024)}' <<<${swap_total})"G"
else
	swap_total+="M"
fi

display "Memory usage" "$memory_usage" "70" "0" "%" " of ${memory_total}"
display "Zram usage" "$swap_usage" "75" "0" "%" " of ${swap_total}"
printf "IP:	     "
printf "\x1B[92m%s\x1B[0m" "$ip_address"
echo "" # fixed newline
display "CPU temp" "$board_temp" $CPU_TEMP_LIMIT "0" "°C" ""
display "Ambient temp" "$amb_temp" $AMB_TEMP_LIMIT "0" "°C" ""
display "Usage of /" "$root_usage" "90" "1" "%" " of $root_total"
echo "" # fixed newline
a=0
display "storage/" "$storage_usage" "90" "1" "%" " of $storage_total" ; a=$((a+$?))
display "storage temp" "$storage_temp" $HDD_TEMP_LIMIT "0" "°C" "" ; a=$((a+$?))
display "Battery" "$battery_percent" "20" "1" "%" "$status_battery_text" ; a=$((a+$?))
(( $a > 0 )) && echo "" # new line only if some value is displayed

line=0
if [[ -n "$PRIMARY_INTERFACE" ]] && vnstat -i "$PRIMARY_INTERFACE" &> /dev/null; then
	traffic=$(vnstat -i $PRIMARY_INTERFACE --oneline | cut -d";" -f4,5)
	traffic_rx=$(echo $traffic | cut -d";" -f1,1 | sed -r 's/([0-9]+\.[0-9]{1})[0-9]*/\1/')
	traffic_tx=$(echo $traffic | cut -d";" -f2,2 | sed -r 's/([0-9]+\.[0-9]{1})[0-9]*/\1/')
	[[ "$traffic" == *"Not enough"* ]] && { traffic_tx="n/a	"; traffic_rx="n/a	"; }
	case $PRIMARY_DIRECTION in
		tx)
			printf "TX today:      \x1B[92m%s\x1B[0m  \t"  "$traffic_tx"
			line=$((line+1))
		;;
		rx)
			printf "RX today:      \x1B[92m%s\x1B[0m  \t"  "$traffic_rx"
			line=$((line+1))
		;;
		both)
			printf "TX today:      \x1B[92m%s\x1B[0m  \t"  "$traffic_tx"
			printf "RX today:      \x1B[92m%s\x1B[0m  \t"  "$traffic_rx"
			line=$((line+1))
		;;
		*) #off or whatever
		;;
	esac
fi

if [[ $(command -v zpool) ]]; then
	zpoolstatus="$(zpool status </dev/stdin 2>&1 )"
	if [[ -n $(echo $zpoolstatus | grep 'not loaded') ]]; then
	:
	elif [[ -n $(echo $zpoolstatus | grep 'degraded\|OFFLINE') ]]; then
		printf "ZFS pool:      "
		echo -ne "\e[0;91mDegraded\x1B[0m"
		line=$((line+1))
	elif [[ -n $(echo $zpoolstatus | grep 'no pools available') ]]; then
		printf "ZFS pool:      "
		echo -ne "n/a"
		line=$((line+1))
	else
		printf "ZFS pool:      "
		echo -ne "\e[0;92mOnline\x1B[0m"
		line=$((line+1))
	fi
fi
[[ $line -ne 0 ]] && echo ""
echo ""

readme.md

Example output:

Welcome to Debian 11 (bullseye) with Linux 5.10.0-26-cloud-amd64
System load:   5%           	Up time:       155 days 2:42	
Memory usage:  16% of 455M   	IP:	     172.31.43.181 10.235.101.1
Usage of /:    15% of 30G    	`