00-header

#!/usr/bin/env bash

# Set to the fortune file you want to use, or empty string for no fortunes
fortune_file=holo

. $(dirname $0)/motd-commons
if [ $fancy -eq 1 ]; then
  printf "Welcome to $(hostname).\n${F_RED}System load is high; simple MOTD will be used${F_RESET}\n"
  exit 0
fi

if [ -r /etc/banner ]; then
  cat /etc/banner
elif [ $(which figlet) ]; then
  figlet $(hostname -s)
fi

if [ ! -z $fortune_file ]; then
   printf " -- %s\n" "$(/usr/games/fortune ${fortune_file})"
fi
echo

[ -r /etc/lsb-release ] && . /etc/lsb-release

os="$DISTRIB_ID $DISTRIB_RELEASE $DISTRIB_CODENAME"
if [ "$os" == "  " ]; then
  os=$(uname -o; uname -r; uname -m)
fi
printf "Welcome to %s, running %s (kernel %s).\n" "$(hostname)" "$os" "$(uname -r)"

10-sysinfo

#!/bin/sh
. $(dirname $0)/motd-commons

echo

printf "System information as of %s\n\n" "$(date)"

if [ $fancy -eq 1 ]; then
  printf "Top by CPU usage\n-----------------\n"
  top -b -n1 | head -n17
  printf "\nTop by mem usage\n-----------------\n"
  top -b -n1 -o %MEM | head -n17 | tail -n+7
  exit 0
fi

load=$(cut -d' ' -f1-3 /proc/loadavg)
uptime=$(uptime -p|sed 's/^up //')
booted=$(date -d "`uptime -s` +"|tr -s ' ')
memory_usage=$(awk '/MemTotal:/ { total=$2 } /MemFree:/ { available=$2 } END { used=total-available; printf "%3.1f%%", used/total*100}' /proc/meminfo)
swap_usage=$(awk '/SwapTotal:/ { total=$2 } /SwapFree:/ { free=$2 } END { if (total=="0") { printf "No swap" } else { used=total-free; printf "%3.1f%%", used/total*100 }}' /proc/meminfo)
time=$(uptime | grep -ohe 'up .*' | sed 's/,//g' | awk '{ printf $2" "$3 }')

printf "%-24s%s (%s)\n" "Online since:" "$booted" "$uptime"
printf "%-24s%s\n" "System load:" "$load"
printf "%s %-10s%s %s\n" "Memory Usage:" "$memory_usage" "Swap Usage:" "$swap_usage"

20-disk-info

#!/bin/sh

. $(dirname $0)/motd-commons

echo

if [ $fancy -eq 1 ]; then
  exit 0
fi

if [ $(which zpool) ]; then
  zpool list -H -p -o name,size,alloc,health | awk '
function human(x) {
  s=" B  KB MB GB TB EB PB YB ZB"
  while (x>=1024 && length(s)>1)
    {x/=1024; s=substr(s,4)}
  s=substr(s,1,3)
  xf=(s==" B  ")?"%5d   ":"%5.2f"
  return sprintf( xf"%s", x, s)
}

{
  pool=$1; size=$2; alloc=$3; health=$4;
  printf "Allocation of %-9s %s / %s (%2.1f%%)", pool":", human(alloc), human(size), alloc/size*100;
  if(health != "ONLINE") { printf " \033[31m(UNHEALTHY)\033[0m" };
  print ""
}'

zfs list -H -p -d 1 -o name,avail,used,usedsnap -t filesystem,volume | grep '/' | awk '
function human(x) {
  s=" B  KB MB GB TB EB PB YB ZB"
  while (x>=1024 && length(s)>1)
    {x/=1024; s=substr(s,4)}
  s=substr(s,1,3)
  xf=(s==" B ")?"%d":"%5.2f"
  if(s==" B ") { s=" B" }
  return sprintf( xf"%s", x, s)
}

{
  name=$1; avail=$2; used=$3; usedsnap=$4;
  printf "Usage of %-14s %s / %s (%s of snapshots)\n", name":", human(used), human(avail), human(usedsnap);
}'
fi

30-who

#!/bin/sh

. $(dirname $0)/motd-commons

if [ $fancy -eq 1 ]; then
  exit
fi

echo

users=$(who|cut -d' ' -f1|sort|uniq -c|sort -nr|awk 'BEGIN {out=""; comma="false"} {out=out (comma == "false" ? comma=true : ", ") $2 " (" $1 " time" ($1 > 1 ? "s" : "")")"} END {print out}')

if [ -z "$users" ]; then
  users="Just you"
fi
printf "Users logged in: %s\n" "$users"

99-final

#!/bin/sh
echo

motd-commons

F_RED="\e[31m"
F_RESET="\e[0m"
fancy_math="$(cut -f1 -d' ' /proc/loadavg) > $(nproc)"
fancy=$(echo $fancy_math | bc -l)

Throw it all into /etc/update-motd.d/ on Debian-based machines for fancy motd
Dependencies: bc, awk, grep, sort, uniq, top, sed, date, uname
Optional: zfs, fortune, figlet, lsb-release

Updates will not be provided; this is v1 of something from a private repo combined with some junk I wrote when I was a wee baby Linux user