Auto‑Show CPU, Memory, and Disk Usage on Linux Login with a Single Script

The author shares a Bash script that automatically presents key system metrics—CPU, memory, disk usage, IP address, load average, and uptime—immediately after logging into a Linux server, giving administrators an instant overview without manually running commands.

Effect Demonstration

Upon login the script prints a colored table showing the collected information, providing a clear sense of system health.

Script Implementation

Create the file /etc/profile.d/sysinfo.sh (or an equivalent user profile file) and insert the following content:

#!/bin/bash

# Colors
GREEN="\033[1;32m"
YELLOW="\033[1;33m"
CYAN="\033[1;36m"
RESET="\033[0m"

# Basic info
HOSTNAME=$(hostname)
UPTIME=$(uptime -p | sed 's/up //')
LOADAVG=$(uptime | awk -F'load average:' '{print $2}' | sed 's/^ //')

# Memory
read MEM_TOTAL MEM_USED <<<$(free -m | awk '/Mem:/ {print $2, $3}')
MEM_PCT=$((MEM_USED * 100 / MEM_TOTAL))

# IP
IP_ADDR=$(hostname -I | awk '{print $1}')

# CPU usage (top method)
CPU_IDLE=$(top -bn2 | grep "Cpu(s)" | tail -n1 | awk -F',' '{print $4}' | grep -o '[0-9.]*')
CPU_USAGE=$(awk "BEGIN {printf \"%.0f\", 100 - $CPU_IDLE}")

# Output system information
echo -e "
${GREEN}Congratulations on logging in, here is the system info!${RESET}"
echo -e "${YELLOW}---------------------------------------------${RESET}"
printf "| %-8s | %-30s |
" "Resource" "Usage"
printf "|----------|--------------------------------|
"
printf "| %-8s | %-30s |
" "IP" "$IP_ADDR"
printf "| %-8s | %-30s |
" "CPU" "$CPU_USAGE%"
printf "| %-8s | %-30s |
" "Memory" "${MEM_USED}MB / ${MEM_TOTAL}MB (${MEM_PCT}%)"
printf "| %-8s | %-30s |
" "Load" "$LOADAVG"
printf "| %-8s | %-30s |
" "Uptime" "$UPTIME"

echo -e "${YELLOW}---------------------------------------------${RESET}"

echo -e "${CYAN}Disk Mount Information${RESET}"
echo -e "${YELLOW}-------------------------------------------------${RESET}"
printf "| %-10s | %-10s | %-10s | %-6s |
" "Mount" "Used" "Total" "Usage"
printf "|------------|------------|------------|--------|
"
df -h -x tmpfs -x devtmpfs | awk 'NR>1 {printf "| %-10s | %-10s | %-10s | %-6s |
", $6, $3, $2, $5}'

echo -e "${YELLOW}-------------------------------------------------${RESET}"
echo -e "${GREEN}Proceed with caution, avoid being the scapegoat!${RESET}
"

Running the Script

Make the script executable: chmod +x /etc/profile.d/sysinfo.sh After this step, every new SSH, TTY, or shell session will display the formatted resource list automatically.

Placement Recommendations

System‑wide effect: /etc/profile.d/sysinfo.sh Current‑user only: ~/.bash_profile or ~/.bashrc Non‑bash shells (e.g., zsh): ~/.zshrc or /etc/zsh/zshrc Keep scripts in /etc/profile.d/ for centralized management.

Additional Notes

Scripts under /etc/profile.d/ must be executable and end with .sh.

Do not place logic that affects all users in personal ~/.bashrc or ~/.bash_profile files.

The script can be extended to display deployed application paths, ports, or other custom information, helping newcomers quickly understand the system’s services.