simple bash login stats

login_stats.sh

#!/bin/bash

# display motd on login, or sudo su - user as that is a login
# sudo vim /etc/profile.d/login_stats.sh

motd(){

SERVER="server-name - aws ec2"

#   15:52:46 up 13 days,  5:27,  1 user,  load average: 0.00, 0.00, 0.00
UPTIME=`uptime`
# trim spaces
UPTIME=`echo $UPTIME`

#               total        used        free      shared  buff/cache   available
# Mem:           7.6G        206M        5.1G         32M        2.3G        7.1G
# Swap:            0B          0B          0B
#MEMORY=`free --mega -h | awk '{ print "\t" $0 }'`
MEMORY=`free --mega -h | grep "Mem"`
MEMORY_TOTAL=`echo "$MEMORY" | awk '{ print $2 }'`
MEMORY_FREE=`echo "$MEMORY" | awk '{ print $4 }'`
MEMORY_OUTPUT=`printf "Total: %-5s Free: %-5s " $MEMORY_TOTAL $MEMORY_FREE`

# Filesystem      Size  Used Avail Use% Mounted on
# devtmpfs        3.7G     0  3.7G   0% /dev
# tmpfs           3.7G     0  3.7G   0% /dev/shm
# tmpfs           3.7G   33M  3.7G   1% /run
# tmpfs           3.7G     0  3.7G   0% /sys/fs/cgroup
# /dev/nvme0n1p2   16G  5.0G   12G  32% /
# /dev/nvme1n1     40G  1.7G   39G   5% /data
# tmpfs           757M     0  757M   0% /run/user/1000
#DISK=`df -h | awk '{ print "\t" $0 }'`
DISK=`df -h`
DISK_ROOT_SIZE=`echo "$DISK" | grep "/dev/nvme0n1p2" | awk '{ print $2 }'`
DISK_ROOT_USED=`echo "$DISK" | grep "/dev/nvme0n1p2" | awk '{ print $3 }'`
DISK_ROOT_AVAIL=`echo "$DISK" | grep "/dev/nvme0n1p2" | awk '{ print $4 }'`
DISK_DATA_SIZE=`echo "$DISK" | grep "/dev/nvme1n1" | awk '{ print $2 }'`
DISK_DATA_USED=`echo "$DISK" | grep "/dev/nvme1n1" | awk '{ print $3 }'`
DISK_DATA_AVAIL=`echo "$DISK" | grep "/dev/nvme1n1" | awk '{ print $4 }'`
DISK_ROOT_OUTPUT=`printf "Size: %-5s Used: %-6s Avail: %-6s " $DISK_ROOT_SIZE $DISK_ROOT_USED $DISK_ROOT_AVAIL`
DISK_DATA_OUTPUT=`printf "Size: %-5s Used: %-6s Avail: %-6s " $DISK_DATA_SIZE $DISK_DATA_USED $DISK_DATA_AVAIL`

# ec2-user pts/0        2020-06-10 15:38 (172.30.0.160)
# WHO=`who`

echo "
┌──────────────────────────────────────────────────────────────────────────────────────────┐
  ○ Server... $SERVER

  ○ Uptime... $UPTIME

  ○ Memory... $MEMORY_OUTPUT

  ○ Disk..... /     $DISK_ROOT_OUTPUT
              /data $DISK_DATA_OUTPUT
└──────────────────────────────────────────────────────────────────────────────────────────┘
"
}

# Only display motd if tty
if [ "$PS1" ]; then
  motd
fi

simple quick login motd/stats
adjust the server-name, disk grep, etc for your system