motd.sh

#!/bin/bash

clear

function color (){
  echo "\e[$1m$2\e[0m"
}

function extend (){
  local str="$1"
  let spaces=60-${#1}
  while [ $spaces -gt 0 ]; do
    str="$str "
    let spaces=spaces-1
  done
  echo "$str"
}

function center (){
  local str="$1"
  let spacesLeft=(78-${#1})/2
  let spacesRight=78-spacesLeft-${#1}
  while [ $spacesLeft -gt 0 ]; do
    str=" $str"
    let spacesLeft=spacesLeft-1
  done
  
  while [ $spacesRight -gt 0 ]; do
    str="$str "
    let spacesRight=spacesRight-1
  done
  
  echo "$str"
}

function sec2time (){
  local input=$1
  
  if [ $input -lt 60 ]; then
    echo "$input seconds"
  else
    ((days=input/86400))
    ((input=input%86400))
    ((hours=input/3600))
    ((input=input%3600))
    ((mins=input/60))
    
    local daysPlural="s"
    local hoursPlural="s"
    local minsPlural="s"
    
    if [ $days -eq 1 ]; then
      daysPlural=""
    fi
    
    if [ $hours -eq 1 ]; then
      hoursPlural=""
    fi
    
    if [ $mins -eq 1 ]; then
      minsPlural=""
    fi
    
    echo "$days day$daysPlural, $hours hour$hoursPlural, $mins minute$minsPlural"
  fi
}

borderColor=35
headerLeafColor=32
headerRaspberryColor=31
greetingsColor=36
statsLabelColor=33

borderLine="━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━"
borderTopLine=$(color $borderColor "┏$borderLine┓")
borderBottomLine=$(color $borderColor "┗$borderLine┛")
borderBar=$(color $borderColor "┃")
borderEmptyLine="$borderBar                                                                              $borderBar"

# Header
header="$borderTopLine\n$borderEmptyLine\n"
header="$header$borderBar$(color $headerRaspberryColor "                        /\/\ (_)_ __   ___ _ __ __ _ 	                       ")$borderBar\n"
header="$header$borderBar$(color $headerRaspberryColor "                       /    \| | '_ \ / _ \ '__/ _\` |                         ")$borderBar\n"
header="$header$borderBar$(color $headerRaspberryColor "                      / /\/\ \ | | | |  __/ | | (_| |                         ")$borderBar\n"
header="$header$borderBar$(color $headerRaspberryColor "                      \/    \/_|_| |_|\___|_|  \__,_|                         ")$borderBar"


me=$(whoami)

# Greetings
greetings="$borderBar$(color $greetingsColor "$(center "Welcome back, $me!")")$borderBar\n"
greetings="$greetings$borderBar$(color $greetingsColor "$(center "$(date +"%A, %d %B %Y, %T")")")$borderBar"

# System information
read loginFrom loginIP loginDate <<< $(last $me --time-format iso -2 | awk 'NR==2 { print $2,$3,$4 }')

# TTY login
if [[ $loginDate == - ]]; then
  loginDate=$loginIP
  loginIP=$loginFrom
fi

if [[ $loginDate == *T* ]]; then
  login="$(date -d $loginDate +"%A, %d %B %Y, %T") ($loginIP)"
else
  # Not enough logins
  login="None"
fi

label1="$(extend "$login")"
label1="$borderBar  $(color $statsLabelColor "Last Login....:") $label1$borderBar"

uptime="$(sec2time $(cut -d "." -f 1 /proc/uptime))"
uptime="$uptime ($(date -d "@"$(grep btime /proc/stat | cut -d " " -f 2) +"%d-%m-%Y %H:%M:%S"))"

label2="$(extend "$uptime")"
label2="$borderBar  $(color $statsLabelColor "Uptime........:") $label2$borderBar"

label3="$(extend "$(free -m | awk 'NR==2 { printf "Total: %sMB, Used: %sMB, Free: %sMB",$2,$3,$4; }')")"
label3="$borderBar  $(color $statsLabelColor "Memory........:") $label3$borderBar"

label4="$(extend "$(df -h ~ | awk 'NR==2 { printf "Total: %sB, Used: %sB, Free: %sB",$2,$3,$4; }')")"
label4="$borderBar  $(color $statsLabelColor "Home space....:") $label4$borderBar"

label5="$(extend "$(ip addr show eth0 | grep 'inet\b' | awk '{print $2}' | cut -d/ -f1)")"
label5="$borderBar  $(color $statsLabelColor "System IP.....:") $label5$borderBar"

stats="$label1\n$label2\n$label3\n$label4\n$label5"

# Print motd
echo -e "$header\n$borderEmptyLine\n$greetings\n$borderEmptyLine\n$stats\n$borderEmptyLine\n$borderBottomLine"
echo -e "\nTo use Minera open your PC browser and connect to the system IP you find above.\n\n"