Chapter-33, LEC-5 | How to Subprocess | #youtube #ethicalhacking #eduacation

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In Python, the subprocess module allows you to spawn new processes, connect to their input/output/error pipes, and obtain their return codes. Here's how you can use the subprocess module in your Python code:

1. Import the subprocess module at the beginning of your Python script by adding the following line of code:

python Copy code

import subprocess

2. Call a command using the subprocess module by using the subprocess.run() function. For example, to run the ls command in the current directory, you would write the following code:

python Copy code

subprocess.run(["ls"])

The subprocess.run() function takes a list of arguments as its first parameter, where each argument is a string representing a command or a command-line option. In the example above, we pass the ls command as the argument.

3. You can also capture the output of the command by passing the capture_output=True argument to subprocess.run(). This will return a CompletedProcess object that contains the output of the command as a byte string. For example, to capture the output of the ls command in the current directory, you would write the following code:

python Copy code

result = subprocess.run(["ls"], capture_output=True)
print(result.stdout.decode())

The result variable will contain the CompletedProcess object, which you can use to obtain the output of the command using the stdout attribute. We decode the byte string to a string using the decode() method, and then print the output.

4. You can also pass input to the command using the input argument to subprocess.run(). For example, to pass the string "hello world" to the echo command, you would write the following code:

python Copy code

result = subprocess.run(["echo"], input=b"hello world\n", capture_output=True)
print(result.stdout.decode())

In this example, we pass the b"hello world\n" byte string as input to the echo command. The b prefix indicates that it is a byte string, and the \n character represents a newline.

These are just a few examples of how you can use the subprocess module in Python. The subprocess module offers many other functions and options for more advanced use cases.

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