How to Check Remote System Status and Processes

Introduction

In this guide, we will learn how to find out if a remote system is still alive, if certain services are running, and which processes are running on the remote system.

Prerequisites

Before proceeding, ensure you have:

1. A remote system with network connectivity
2. Access to command-line tools

Checking Remote System Status

1. Ping: Use the ping command to check if the remote system is reachable:
   

   ping -c 4 <remote_system_ip>

2. Nmap: Use the nmap command to discover hosts and services on a network:
   

   nmap <remote_system_ip>

Checking Service Status

1. Telnet: Use telnet to check if a specific service is running on a remote system. For example, to check if SSH service is running:
   

   telnet <remote_system_ip> 22

2. Netcat (nc): Use nc to check if a port is open on a remote system. For example, to check if port 80 is open:
   

   nc -zv <remote_system_ip> 80

Checking Running Processes

1. SSH: Use SSH to remotely login to a system and check running processes:
   

   ssh <remote_system_ip> ps aux

Conclusion

Congratulations! You have learned how to check the status of a remote system, including its services and running processes, using command-line tools on Linux.