Setting an attractive message of the day(MOTD) banner in Ubuntu 16,Linux Teacher Sourav,Kolkata 09748184075

# install lsb-release
apt-get install lsb-release
# install figlet to enable ASCII art
apt-get install figlet
# install update-motd software
apt-get install update-motd
# delete default directory
rm -r /etc/update-motd.d/
# create new directory
mkdir /etc/update-motd.d/
# create dynamic files
touch /etc/update-motd.d/00-header ; touch /etc/update-motd.d/10-sysinfo ; touch /etc/update-motd.d/90-footer
# make files executable
chmod +x /etc/update-motd.d/*
# remove MOTD file
rm /etc/motd.dynamic


The 00-header file should contain

#!/bin/sh
#
#    00-header - create the header of the MOTD
#    Copyright (c) 2013 Nick Charlton
#    Copyright (c) 2009-2010 Canonical Ltd.
#
#    Authors: Nick Charlton
#             Dustin Kirkland
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License along
#    with this program; if not, write to the Free Software Foundation, Inc.,
#    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

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

if [ -z "$DISTRIB_DESCRIPTION" ] && [ -x /usr/bin/lsb_release ]; then
        # Fall back to using the very slow lsb_release utility
        DISTRIB_DESCRIPTION=$(lsb_release -s -d)
fi

figlet $(hostname)
printf "\n"

printf "Welcome to %s (%s).\n" "$DISTRIB_DESCRIPTION" "$(uname -r)"
printf "\n"


****************************************************************************************
The 10-sysinfo file should contain


#!/bin/sh
TERM=linux
export TERM
upSeconds="$(/usr/bin/cut -d. -f1 /proc/uptime)"
secs=$((${upSeconds}%60))
mins=$((${upSeconds}/60%60))
hours=$((${upSeconds}/3600%24))
days=$((${upSeconds}/86400))
UPTIME=`printf "%d days, %02dh%02dm%02ds" "$days" "$hours" "$mins" "$secs"`

# get the load averages
read one five fifteen rest < /proc/loadavg

echo "$(tput setaf 2)
   .~~.   .~~.    `date +"%A, %e %B %Y, %r"`
  '. \ ' ' / .'   `uname -srmo`$(tput setaf 1)
   .~ .~~~..~.
  : .~.'~'.~. :   Uptime.............: ${UPTIME}
 ~ (   ) (   ) ~  Memory.............: `cat /proc/meminfo | grep MemFree | awk {'print $2'}`kB (Free) / `cat /proc/meminfo | grep MemTotal | awk {'print $2'}`kB (Total)
( : '~'.~.'~' : ) Load Averages......: ${one}, ${five}, ${fifteen} (1, 5, 15 min)
 ~ .~ (   ) ~. ~  Running Processes..: `ps ax | wc -l | tr -d " "`
  (  : '~' :  )   IP Addresses.......: `ip a | grep glo | awk '{print $2}' | head -1 | cut -f1 -d/` and `wget -q -O - http://icanhazip.com/ | tail`
   '~ .~~~. ~'    Weather............: `curl -s "http://rss.accuweather.com/rss/liveweather_rss.asp?metric=1&locCode=EUR|UK|UK001|NAILSEA|" | sed -n '/Currently:/ s/.*: \(.*\): \([0-9]*\)\([CF]\).*/\2°\3, \1/p'`
       '~'
$(tput sgr0)"


***************************************************************************************************
I also have a backup 10-sysinfo file which contains

#!/bin/bash
#
#    10-sysinfo - generate the system information
#    Copyright (c) 2013 Nick Charlton
#
#    Authors: Nick Charlton
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License along
#    with this program; if not, write to the Free Software Foundation, Inc.,
#    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

date=`date`
load=`cat /proc/loadavg | awk '{print $1}'`
root_usage=`df -h / | awk '/\// {print $(NF-1)}'`
memory_usage=`free -m | awk '/Mem:/ { printf("%3.1f%%", $3/$2*100) }'`
swap_usage=`free -m | awk '/Swap:/ { printf("%3.1f%%", $3/$2*100) }'`
users=`users | wc -w`
time=`uptime | grep -ohe 'up .*' | sed 's/,/\ hours/g' | awk '{ printf $2" "$3 }'`
processes=`ps aux | wc -l`
ip=`ifconfig $(route | grep default | awk '{ print $8 }') | grep "inet addr" | awk -F: '{print $2}' | awk '{print $1}'`

echo "System information as of: $date"
echo
printf "System Load:\t%s\tIP Address:\t%s\n" $load $ip
printf "Memory Usage:\t%s\tSystem Uptime:\t%s\n" $memory_usage "$time"
printf "Usage On /:\t%s\tSwap Usage:\t%s\n" $root_usage $swap_usage
printf "Local Users:\t%s\tProcesses:\t%s\n" $users $processes
echo
/usr/lib/update-notifier/update-motd-reboot-required
/usr/lib/update-notifier/apt-check --human-readable
echo

*************************************************************************************************

The 90-footer file contains

#!/bin/sh
#
#    99-footer - write the admin's footer to the MOTD
#    Copyright (c) 2013 Nick Charlton
#    Copyright (c) 2009-2010 Canonical Ltd.
#
#    Authors: Nick Charlton
#             Dustin Kirkland
#
#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
#    the Free Software Foundation; either version 2 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License along
#    with this program; if not, write to the Free Software Foundation, Inc.,
#    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

[ -f /etc/motd.tail ] && cat /etc/motd.tail || true

***********************************************************************************************


Now you should see this motd message when you try to login in a different run level

to see this in gui which is run level 7 you have to type

cat /var/run/motd.dynamic



Source:
https://oitibs.com/ubuntu-16-04-dynamic-motd/
https://ownyourbits.com/2017/04/05/customize-your-motd-login-message-in-debian-and-ubuntu/

reference
https://www.resellerspanel.com/articles/cloud-web-hosting-articles/crontab/which-files-can-be-executed-with-crontab/
https://askubuntu.com/questions/319528/how-to-see-the-details-which-ubuntu-shows-at-the-time-of-login-anytime