dynamic-motd

#!/bin/bash
set -e

FAILED=$(systemctl list-units --state=failed --no-legend --plain)

sensor="coretemp-isa-0000"

USER=$(whoami)
HOSTNAME=$(uname -n)
TEMPERATURE=$(sensors $sensor | awk 'NR==3{print $4}')

MEMORY1=$(free -t -m | grep "Mem" | awk '{print $3;}')
MEMORY2=$(free -t -m | grep "Mem" | awk '{print $2 " MB";}')
PSA=$(ps -Afl | wc -l)

#System uptime
uptime=$(cut </proc/uptime -f1 -d.)
upDays=$((uptime / 60 / 60 / 24))
upHours=$((uptime / 60 / 60 % 24))
upMins=$((uptime / 60 % 60))
upSecs=$((uptime % 60))

#System load
LOAD=$(awk '{print $1", "$2", "$3}' /proc/loadavg)

IP_BR0=$(ifconfig enp0s31f6 | grep -E 'inet ' | awk '{print $2}')

# disk temperature
DISKS=($(lsblk -dl | tail -n +2 | grep -P -v "SWAP|loop" | cut -d' ' -f1))
DISK_TEMPS=''

for D in "${DISKS[@]}"; do
    DEV="/dev/${D}"
    temp=$(smartctl -A $DEV | grep 'Temperature' | head -n 1 | grep -oE '\s[0-9]{2}(\s|$)' | xargs)
    health=$(smartctl -H $DEV | grep 'test result' | cut -d':' -f2 | xargs)
    DISK_TEMPS+="$D,$temp,$health\n"
done

# zfs pools
BIFS="$IFS"
IFS=$'\n'
POOL_DATA=($(zpool list | tail -n +2))
POOLS=''

for P in "${POOL_DATA[@]}"; do
        p_name=$(echo "$P" | awk '{print $1}')
        p_size=$(echo "$P" | awk '{print $2}')
        p_free=$(echo "$P" | awk '{print $4}')
        p_health=$(echo "$P" | awk '{print $10}')
        POOLS+="$p_name,$p_free/ $p_size,$p_health\n"
done
IFS="$BIFS"


#Return message
[ -z "$TEMPERATURE" ] && TEMPERATURE="not available"
[ -x "$(command -v sensors)" ] || TEMPERATURE="lm_sensors not found"

echo -ne "Generated at $(date)

  System information
  ------------------
  Hostname:               $HOSTNAME
  Release:                $(</etc/redhat-release)
  Users:                  Currently $(users | wc -w) user(s) logged on
  IPv4 address for enp0:  $IP_BR0

  System load:            $LOAD (1, 5, 15 min)
  Memory usage:           $MEMORY1 / $MEMORY2
  Swap usage:             $(free -m | tail -n 1 | awk '{print $3}') MB
  Processes:              $PSA
  Uptime:                 $upDays days $upHours hours $upMins minutes $upSecs seconds
  CPU Temperature:        $TEMPERATURE

  Disks
  ------------
"
printf "$DISK_TEMPS" | column --table --table-columns='Device,Temp (°C),Health' --separator=',' | awk '{print "  " $0}'
echo -ne "
  ZFS Pools
  ---------
"
printf "$POOLS" | column --table --table-columns='Pool,Usage,State'  --separator=',' | awk '{print "  " $0}'
echo