Ubuntu like motd for arch linux systems

MOTD.md

#!/usr/bin/env bash
#              ____      __    __          __  __  _
#   ____ ___  / __/___ _/ /_  / /_  ____ _/ /_/ /_(_)
#  / __ `__ \/ /_/ __ `/ __ \/ __ \/ __ `/ __/ __/ /
# / / / / / / __/ /_/ / /_/ / / / / /_/ / /_/ /_/ /
#/_/ /_/ /_/_/  \__, /_.___/_/ /_/\__,_/\__/\__/_/
#              /____/
#
# https://gist.github.com/mfgbhatti/2c2ea5da5d6d7e608d90fd43d4daa4a8


# This script provide ubuntu like MOTDS on Arch Linux servers.
# This MOTD uses the checkupdates command to obtain the list of upgradeables packages
# so it is necessary to install. After kernel update show you restart your system to apply kernel.
# Show system IPs (may be you have to tinker the a bit)
# Show memory usage
# CPU load
# user signed in
# system up time
# and more
## Installation
# copy this to /usr/bin/update_motd.sh
# make it executable (chmod +x)
# edit /etc/pam.d/sshd and add
# session    optional   pam_exec.so   stdout /usr/bin/update_motd.sh
# Make sure this will be trigger when you ssh to your server
# Enjoy


motd() {
    # Variables
    MOTD_DATE="$(date)"
    MOTD_MEMORY="$(free -m | awk '/Mem/ { printf("%3.1f%%", $3/$2*100) }')"
    MOTD_SWAP="$(free -m | awk '/Swap/ { printf("%3.1f%%", $3/$2*100) }')"
    # MOTD_ROOT_FULL="$(df -h / | awk '/\// {print $(NF-2)}')"
    # MOTD_ROOT_USED="$(df -h / | awk '/\// {print $(NF-1)}')"
    MOTD_ROOT_FULL=" $(df -l --total -h | awk -F' ' '/total/{print $2}')B"
    MOTD_ROOT_USED="$(df -l --total -h | awk -F' ' '/total/{print $3}')B"
    MOTD_ROOT_PERCENT="$(df -l --total -h | awk -F' ' '/total/{print $5}')"
    MOTD_CPU_LOAD="$(awk '{print $1}' /proc/loadavg)"
    MOTD_UPDATES="$(checkupdates | wc -l)"
    MOTD_USERS="$(users | wc -w)"
    MOTD_PROCS="$(ps aux | wc -l)"
    MOTD_DOCKER="$(ip addr show | grep -v inet6 | grep inet | awk 'NR==4 {print $2}' | cut -d/ -f 1)"
    # MOTD_IP4="$(ip addr show | grep -v inet6 | grep inet | awk 'NR==2 {print $2}' | cut -d/ -f 1)"
    # MOTD_IP4="$(ip addr show | awk '/eth0/ {print $2}' | tail -1 | cut -d/ -f1)"
    MOTD_IP6="$(ip addr show | grep inet6 | awk 'NR==2 {print $2}' | cut -d/ -f1)"
    MOTD_IP4="$(ip addr show | awk '/eth0/ {print $2}' | sed -n '2p;' | sed 's!/.*!!')"

    # System uptime
    UPTIME="$( cut -f1 -d. </proc/uptime)"
    UPDAYS="$(( UPTIME/60/60/24 ))"
    UPHOURS="$(( UPTIME/60/60%24 ))"
    UPMINS="$(( UPTIME/60%60 ))"
    UPSECS="$(( UPTIME%60 ))"

    # Statements
    if [[ "$UPHOURS" -lt "10" ]]; then
        UPHOURS="0$UPHOURS"
    fi
    if [[ "$UPMINS" -lt "10" ]]; then
        UPMINS="0$UPMINS"
    fi
    if [[ "$UPSECS" -lt "10" ]]; then
        UPSECS="0$UPSECS"
    fi

    # Check for kernels
    if pacman -Q linux > /dev/null 2>&1; then
        NEW_KERNEL="$(pacman -Q linux | cut -d " " -f 2 | sed 's/.ar.*$//')" # for linux kernel
        OLD_KERNEL="$(uname -r | sed 's/-ar.*$//')"
    else
        NEW_KERNEL="$(pacman -Q linux-lts | cut -d " " -f 2 | sed 's/.ar.*$//')" # for linux-lts kernel
        OLD_KERNEL="$(uname -r | cut -d "-" -f 1,2)"
    fi

    # Outputs
    printf "Welcome to %s (%s)\n" "Arch Linux" "$(uname -r)"
    printf "\n"
    printf "\t* Documentation:\thttps://wiki.archlinux.org/\n"
    printf "\t* Management:\t\thttps://wiki.archlinux.org/title/List_of_applications\n"
    printf "\t* Support:\t\thttps://wiki.archlinux.org/title/Frequently_asked_questions\n"
    printf "\t* Base:\t\t\thttps://wiki.archlinux.org/title/XDG_Base_Directory\n"
    printf "\n"
    printf "System information as of %s\n" "$MOTD_DATE"
    printf "\n"
    printf "\tSystem Uptime:\t\t%s Days and %s:%s:%s\n" "$UPDAYS" "$UPHOURS" "$UPMINS" "$UPSECS"
    printf "\tSystem load:\t\t%s\n" "$MOTD_CPU_LOAD"
    printf "\tUsage of /:\t\t%s / %s (%s)\n" "$MOTD_ROOT_USED" "$MOTD_ROOT_FULL" "$MOTD_ROOT_PERCENT"
    printf "\tMemory usage:\t\t%s\n" "$MOTD_MEMORY"
    printf "\tSwap usage:\t\t%s\n" "$MOTD_SWAP"
    printf "\tProcesses:\t\t%s\n" "$MOTD_PROCS"
    printf "\tUsers logged in:\t%s\n" "$MOTD_USERS"
    printf "\tIP address for docker:\t%s\n" "$MOTD_DOCKER"
    printf "\tIPv4 address for eth0:\t%s\n" "$MOTD_IP4"
    printf "\tIPv6 address for eth0:\t%s\n" "$MOTD_IP6"
    printf "\n"
    printf "%s updates can be applied immediately.\n" "$MOTD_UPDATES"
    [[ "$NEW_KERNEL" > "$OLD_KERNEL" ]] && printf "\n\n*** System restart required ***\n"

}

motd