Useful scripts

aioshot.py

"""
aiohttp shooting
"""
import os
import asyncio
import aiohttp
import time


url = "https://example/isalive"


sema = asyncio.Semaphore(1000)


async def fetch_page(session, k):
    with await sema:
        try:
            with aiohttp.Timeout(20):
                print("[*] Starting {}".format(k))
                start = time.perf_counter()

                async with session.get(url) as response:
                    delta = time.perf_counter() - start
                    print("Status: {}, Latency: {}, Request: {}".format(response.status, delta, k))
                    return await response.read()
        except Exception as ex:
            print(ex)
            print("[*] Failed to do request {}. {}".format(k, str(ex)))


def shooting():
    loop = asyncio.get_event_loop()

    headers = {
        "User-Agent": "Mozilla/5.0 (X11; Linux i686) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.27 Safari/537.17"
    }

    with aiohttp.ClientSession(loop=loop, headers=headers) as session:
        tasks = [fetch_page(session, k) for k in range(1000)]
        loop.run_until_complete(asyncio.wait(tasks))

    loop.close()


shooting()

empty-file.sh

# to empty a text file:
truncate -s 0 filename

fix-copyright.sh

# example bash script to fix copyright in files (set years properly)
find . -type f -exec sed -i 's/Copyright\s2016/Copyright 2017/g' {} +

hide-files.sh

# To hide files creating an .hidden file;
# for example .pyc files

ls *.py[co] >> .hidden

linux-info.sh

# operating system info:
cat /etc/*-release

# hardware info:
lscpu

uname -a

open-files-limit.sh

# to display the limit of open files:
ulimit -a

# to edit it, it's different in every distribution:
# in arch linux, do (not sure what works):

I solved it by editing /etc/security/limits.conf and adding the following to the end of the file, replacing "username" with that you're using to run whatever software it is that needs that many files open concurrently:
@username           soft    nofile          8192
@username           hard    nofile          8192

# by editing and uncommenting this entry in /etc/systemd/system.conf:
DefaultLimitNOFILE=500000

# changing the /etc/security/limits.conf doesn't work, apparently
# https://bbs.archlinux.org/viewtopic.php?id=202694