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Here are several different ways to test a TCP port without telnet.

BASH (man page)

$ cat < /dev/tcp/127.0.0.1/22
SSH-2.0-OpenSSH_5.3
^C

$ cat &lt; /dev/tcp/127.0.0.1/23

See how a minor change to your commit message style can make you a better programmer.

Format: <type>(<scope>): <subject>

<scope> is optional

国内从 Docker Hub 拉取镜像有时会遇到困难，此时可以配置镜像加速器。Docker 官方和国内很多云服务商都提供了国内加速器服务。

Dockerized 实践 https://github.com/y0ngb1n/dockerized

Ubuntu 16.04+、Debian 8+、CentOS 7+

curl -s https://api.github.com/repos/jgm/pandoc/releases/latest \
| grep "browser_download_url.*deb" \
| cut -d : -f 2,3 \
| tr -d \" \

	#!/usr/bin/env python
	import argparse


	def main(command_line=None):
	parser = argparse.ArgumentParser('Blame Praise app')
	parser.add_argument(
	'--debug',
	action='store_true',
	help='Print debug info'

	According to all known laws
	of aviation,


	there is no way a bee
	should be able to fly.


	Its wings are too small to get
	its fat little body off the ground.

	import streamlit as st
	import concurrent.futures # We'll do computations in separate processes!
	import mymodule # This is where you'll do the computation

	# Your st calls must go inside this IF block.
	if __name__ == '__main__':
	st.write("Starting a long computation on another process")

	# Pick max number of concurrent processes. Depends on how heavy your computation is, and how
	# powerful your machine is.

	' Disables Vanguard from starting when you boot your computer
	Call CreateObject("Shell.Application").ShellExecute("cmd.exe", "/c ""sc config vgc start= disabled & sc config vgk start= disabled""", "", "runas")

	defaults write com.apple.Dock appswitcher-all-displays -bool true
	killall Dock