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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""
shorten_names.py — Safely shorten file/dir names to <= max bytes (UTF-8), with dry-run & statistics.
Linux/macOS.

Changes vs prior version:
- Predict and avoid collisions even in dry-run using per-directory "reserved" names
- Optional case-insensitive collision mode (default True on macOS)
- Safer last-resort truncation edge path

gaoyifan

User Mode Linux on Debian Jessie

host kernel version: 3.16.36-1+deb8u2

target kernel version: 4.9-rc5

Build UML kernel

Preparation

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server {
	listen 80;
	listen 443;
	listen [::]:80;
	listen [::]:443;
	
	server_name fonts.lug.ustc.edu.cn;
	access_log	/var/log/nginx/revproxy_access.log;
	error_log	/var/log/nginx/revproxy_error.log;
	

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#! /usr/sbin/nft -f

chain tc-wan {
	# check default priority
	mark & 0xff0 == 0x130 ip dscp set af22 return

	# real-time application
	## Dota2
	udp dport 27000-27200 \
	meta mark set mark & 0xfffff00f ^ 0x110 ip dscp set af41 return

gaoyifan

# from https://gist.github.com/likamrat/cae833a6e5b3461709f14c093c21c293?permalink_comment_id=4634351#gistcomment-4634351
# Install Chocolately Package Manager
[Net.ServicePointManager]::SecurityProtocol = [Net.ServicePointManager]::SecurityProtocol -bor [Net.SecurityProtocolType]::Tls12
Set-ExecutionPolicy Bypass -Scope Process -Force; iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))
$env:Path = [System.Environment]::ExpandEnvironmentVariables([System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User"))

# Install WinGet from Chocolatey
choco install winget
choco install winget.powershell

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#!/usr/bin/env bash

# require: git version > 2.3
# require: `db/letsencrypt` existed in git repo

if [[ -z "$CERTBOT_DOMAIN" ]] || [[ -z "$CERTBOT_VALIDATION" ]]; then
    echo '$CERTBOT_DOMAIN and $CERTBOT_VALIDATION environment variables required.'
fi

source /etc/letsencrypt/dns-auth.conf

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import ipaddress

def hex_to_cidr(hex_str):
    i = 0
    while i < len(hex_str):
        # The first byte is the mask
        mask = int(hex_str[i:i+2], 16)
        i += 2

        # Calculate how many bytes the subnet will occupy

gaoyifan

import cv2
import pyqrcode
import numpy as np
import io

# Set the width, height and frame rate of the video
width, height, fps = 512, 512, 10

# Create a video writer object, using FFmpeg

gaoyifan

ubuntu 添加新硬盘

查看硬盘：

# fdisk -l
...
Disk /dev/sdb: 274.9 GB, 274877906944 bytes
255 heads, 63 sectors/track, 33418 cylinders, total 	536870912 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes

gaoyifan

#!/usr/bin/env bash
set -xe

apt install -y build-essential git gcc-arm-none-eabi bison flex device-tree-compiler bc debootstrap

BASE=${BASE:-$(mktemp -d)}

cd $BASE
pwd
git clone https://github.com/ARM-software/arm-trusted-firmware.git