Dynamic motd generator for Alpine Linux

99-motd.sh

#!/bin/sh

. /etc/os-release

PRETTY_NAME=`awk -F= '$1=="PRETTY_NAME" { print $2 ;}' /etc/os-release | tr -d '"'`
VERSION_ID=`awk -F= '$1=="VERSION_ID" { print $2 ;}' /etc/os-release`
UPTIME_DAYS=$(expr `cat /proc/uptime | cut -d '.' -f1` % 31556926 / 86400)
UPTIME_HOURS=$(expr `cat /proc/uptime | cut -d '.' -f1` % 31556926 % 86400 / 3600)
UPTIME_MINUTES=$(expr `cat /proc/uptime | cut -d '.' -f1` % 31556926 % 86400 % 3600 / 60)
cat > /etc/motd << EOF
%+++++++++++++++++++++++++++++++ SERVER INFO ++++++++++++++++++++++++++++++++%
%                                                                            %
        Name: `hostname`
        Uptime: $UPTIME_DAYS days, $UPTIME_HOURS hours, $UPTIME_MINUTES minutes
        CPU: `cat /proc/cpuinfo | grep 'model name' | head  -1 | cut -d':' -f2`
        Memory: `free -m | head -n 2 | tail -n 1 | awk {'print  $2'}`M
        Swap: `free -m | tail -n 1 | awk {'print $2'}`M Disk: `df -h / | awk  '{ a = $2 } END { print a }'`

        Kernel: `uname -r`
        Distro: $PRETTY_NAME
        Version $VERSION_ID

        CPU Load: `cat /proc/loadavg | awk '{print $1 ", " $2 ", " $3}'`
        Free Memory: `free -m | head -n 2 | tail -n 1 | awk {'print $4'}`M
        Free Swap: `free -m | tail -n 1 | awk {'print $4'}`M
        Free Disk: `df -h / | awk '{ a =  $2 } END { print a }'`

        eth0 Address: `ifconfig eth0 | grep "inet addr" |  awk -F: '{print $2}' | awk '{print $1}'`
%                                                                            %
%++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%
EOF

README.md

Custom MOTD on Alpine

This assumes sudo and bash are installed and bash has been set to the default shell.

# download gist
git clone https://gist.github.com/d2cc2ef4ba6d5291f3f6d0c51fc3e099.git motd
cd motd

# copy to /etc
sudo cp 99-motd.sh /etc/

# ~/.bashrc
# Display MOTD on interactive login shells
if [ -n "$PS1" ] && [ -f /etc/99-motd.sh ]; then
    . /etc/99-motd.sh
fi

# ~/.profile
. .bashrc