![]() ![]() ![]() This is just a preprocessing step # to make sure there aren't any unnecessary lines. # Iterate over all the servers that we read from the text file # and remove all the extra lines. # Get the list of servers from the text file servers = list(open( 'servers.txt')) # store the output in the list outputlist. # get the output as a string output = str(temp. # Iterate over all the servers in the list and ping each server for server in servers: # The command you want to execute cmd = 'ping' # send one packet of data to the host # this is specified by '-c 1' in the argument list outputlist = Only the servers that exist can be “pinged”. I have added 4 servers, out of which two exist and the other two do not. ![]() The Python script will read from this file and ping each server listed in it. We also need to create a file called “servers.txt”, where we can add a list of all the servers we need to ping. The subprocess library has a class called Popen() that allows us to execute shell commands and get the output of the command.Ĭreate a Python file and add the following code. This module intends to replace several older modules and functions. CodeĪccording to the official documentation, the subprocess module allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. A better approach is to use Python to automate this process. However, when you have a considerable amount of machines, it will be extremely tedious and time-consuming to manually ping them. This would be a good use case when you have multiple hosts, servers, or VMs(AWS ec2 instances) and want to check if they are up and running without any problems.Ī simple solution is to just ping these servers and see if they respond to the request. Let’s use the subprocess library to write a script that pings multiple servers to see whether they are reachable or not. This documentation explores the motivation behind creating this module. Therefore, we are going to use subprocess in this tutorial. This cannot be done in the os module.Īlthough you can execute commands using the OS module, the subprocess library provides a better and newer approach and is officially recommended. The subprocess module returns an object that can be used to get more information on the output of the command and kill or terminate the command if necessary. The os.system function simply runs the shell command and only returns the status code of that command. The subprocess module overcomes these vulnerabilities and is more secure. Os.system directly executes shell commands and is susceptible to vulnerabilities. The subprocess module serves as a replacement to this and Python officially recommends using subprocess for shell commands. In other words, this function has been replaced. The subprocess library provides a better, safer, and faster approach for this and allows us to view and parse the output of the commands. In some commands, it is imperative to read the output and analyze it. However, we can’t read and parse the output of the command. The program above lists all the files inside a directory. The os.system() function allows users to execute commands in Python.
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