Alpine Linux Dynamic MOTD

motd

#!/bin/sh
#/etc/periodic/15min/motd

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
%--------------------------------------------------------------%
    Hostname: `hostname`.`dnsdomainname`
    Uptime: $UPTIME_DAYS days, $UPTIME_HOURS hours, $UPTIME_MINUTES minutes
    Distro: `uname -v` with `uname -r`

    CPU: `cat /proc/loadavg | awk '{print $1 ", " $2 ", " $3}'`
    Disk: `df -h / | tail -n 1 | awk {'print $3'}` / `df -h / | tail -n 1 | awk {'print $2'}` (`df -h / | tail -n 1 | awk {'print $5'}` used)
    Memory: `free -m | head -n 2 | tail -n 1 | awk {'print $3'}`M / `free -m | head -n 2 | tail -n 1 | awk {'print $2'}`M
    Swap: `free -m | tail -n 1 | awk {'print $3'}`M / `free -m | tail -n 1 | awk {'print $4'}`M

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

%--------------------------------------------------------------%
    Hostname: alpine.arneman.home
    Uptime: 27 days, 14 hours, 9 minutes
    Distro: #1-Alpine SMP Tue Jun 18 13:00:27 UTC 2019 with 4.19.52-0-virt

    CPU: 0.12, 0.11, 0.09
    Disk: 16.1G / 29.0G (58% used)
    Memory: 7903M / 7967M
    Swap: 864M / 1106M

    IP Address: 10.0.0.40
%--------------------------------------------------------------%