CMCDragonkai

Python subprocess.run and argparse nargs (multi-value options) is tricky

If you have a Python program that uses argparse nargs to specify multi-value options then you need to make sure that each value is its own parameter.

import subprocess

subprocess.run(
    [
 'command',

csrutil

#!/bin/bash                                                                                                                                                                                                                                                                                                              
                                                                                                                                                                                                                                                                                                                         
country_block=(china bangladesh cambodia hongkong india iran iraq jordan korea kuwait malysia morocco oman pakistan qatar saudi singapore sudan thailand taiwan emirates vietnam turkey)                                                                                                                                 
                                                                                  

EdwardBetts

from pprint import pformat
from typing import Any

from pygments import highlight
from pygments.formatters import Terminal256Formatter
from pygments.lexers import PythonLexer


def pprint_color(obj: Any) -> None:
    """Pretty-print in color."""

P7h

tmux vs. screen commands

---

Action	tmux	screen
start a new session	tmux tmux new tmux new-session	screen
start a new session with a name	tmux new -s name	screen -S name
re-attach a detached session	tmux attach tmux attach-session	screen -r
re-attach a detached session with a name	tmux attach -t name tmux a -t name	screen -r name
re-attach an attached session (detaching it from elsewhere)	tmux attach -dtmux attach-session -d	screen -dr

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs