Thursday, April 14, 2022

[SOLVED] Is there any other altrenative to ">" in BASH w/ Python Subprocess

Issue

I am trying to print out my outputs into a log file, I am using python with subprocess to do so. But when I use > in code, I am getting error like:

+ klm.py scan /home '>' /home/userA/out/home_03-30-2022_11-07-32.log

2022-03-30 09:09:21,074 ERROR > does not exist

Here is the code I am running:

subprocess.run(['sudo', 'docker', 'run', '-it', '--rm', '-w', '/workdir', '-v', f'{pwd}:/workdir:ro', 'docker-local.abc.xyz.xyz.name.com/klm', 'klm.py', 'scan', f"{pwd}", ">", f'/home/userA/out{directory}_{date_time}.log'])

Whenever I use the command itself directly into the terminal, command is working working without any error and creating the .log files, I assume this is error coming from subprocess or python side.

> directory variable is a for loop of list elements -> DIRECTORIES = [/home, /root, etc]

> datetime just a string -> date_time 

> pwd is -> pwd = os.getcwd()

> I don't know if it is useful info but I am using Kali Linux for this

Solution

I'd like to show a standard output redirection on a simpler command. It prints the date and time to a file. First using shell's redirection and then without the shell's help (shell=False is the default)

import subprocess

# with shell redirection
subprocess.run(['date >out1.txt'], shell=True)

# without shell
with open('out2.txt', 'w') as out:
    subprocess.run(['date'], stdout=out)

Note: the documentation asks you to read the Security Considerations before using shell=True.



Answered By - VPfB
Answer Checked By - Candace Johnson (WPSolving Volunteer)
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