sh 自定义motd.d消息为Ubuntu 16.4

Posted 2021-05-07

If you have ever used Ubuntu Server prior to its newest release of 16.04, then you should be familiar with the dynamic MOTD. Previously, this is what is presented to the user in terminal when a log on occurs.

This feature is very nice as it will give you a quick look at useful information. Unfortunately, Ubuntu Server 16.04 does not include the dynamic MOTD by default in this release. First you will need to install some prerequisites and build the directory structure. To do so, run the following commands in terminal.

```bash
apt-get install lsb-release
apt-get install figlet
apt-get install update-motd
rm -r /etc/update-motd.d/
mkdir /etc/update-motd.d/
touch /etc/update-motd.d/00-header ; touch /etc/update-motd.d/10-sysinfo ; touch /etc/update-motd.d/90-footer
chmod +x /etc/update-motd.d/*
rm /etc/motd.dynamic
```

Once the above commands have been run, you can move on to populating the files you created. Below you can copy and paste.

- `curl -L https://goo.gl/N7btgM > /etc/update-motd.d/00-header`
- `curl -L https://goo.gl/Z4zKtJ > /etc/update-motd.d/10-sysinfo`
- `curl -L https://goo.gl/tYuRK9 > /etc/update-motd.d/90-footer`

#!/bin/sh
#
# MIT License
#
# Copyright (c) 2017 Donovan Dikaio <[e-mail]>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

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

#!/bin/sh
#
# MIT License
#
# Copyright (c) 2017 Donovan Dikaio <[e-mail]>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

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

#!/bin/sh
#
# MIT License
#
# Copyright (c) 2017 Donovan Dikaio <[e-mail]>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
 
[ -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"