ttys3

FAQ on the xz-utils backdoor

Background

On March 29th, 2024, a backdoor was discovered in xz-utils, a suite of software that gives developers lossless compression. This package is commonly used for compressing release tarballs, software packages, kernel images, and initramfs images. It is very widely distributed, statistically your average Linux or macOS system will have it installed for

ttys3

# When i was faced with this warning in lvm when i run lvm command it works but it took
# WARNING: Device /dev/dm-20 not initialized in udev database even after waiting 10000000 microseconds.
# It look my problem is solved by reloading udev rules without reboot with this command:
udevadm control --reload-rules && udevadm trigger

ttys3

ANSI Escape Sequences

Standard escape codes are prefixed with Escape:

• Ctrl-Key: ^[
• Octal: \033
• Unicode: \u001b
• Hexadecimal: \x1B
• Decimal: 27

ttys3

#!/usr/bin/env bash

set -eou pipefail

if [ "$#" -ne 2 ]; then
  echo "Usage: $0 input_file output_file"
  exit 1
fi

input_file="$1"

ttys3

use std::str;

fn main() {
  // -- FROM: vec of chars --
  let src1: Vec<char> = vec!['j','{','"','i','m','m','y','"','}'];
  // to String
  let string1: String = src1.iter().collect::<String>();
  // to str
  let str1: &str = &src1.iter().collect::<String>();
  // to vec of byte

ttys3

// ConsoleHandler formats slog.Logger output in console format, a bit similar with Uber's zap ConsoleEncoder
// The log format is designed to be human-readable. 
// 
// Performance can definitely be improved, however it's not in my priority as 
// this should only be used in development environment.
//
// e.g. log output:
// 2022-11-24T11:40:20+08:00 DEBUG ./main.go:162 Debug message {"hello":"world","!BADKEY":"bad kv"}
// 2022-11-24T11:40:20+08:00 INFO ./main.go:167 Info message {"with_key_1":"with_value_1","group_1":{"with_key_2":"with_value_2","hello":"world"}}
// 2022-11-24T11:40:20+08:00 WARN ./main.go:168 Warn message {"with_key_1":"with_value_1","group_1":{"with_key_2":"with_value_2","hello":"world"}}

ttys3

#!/bin/sh

/usr/bin/dbus-send --type=method_call --dest=org.gnome.ScreenSaver /org/gnome/ScreenSaver org.gnome.ScreenSaver.SetActive boolean:true && /usr/bin/sleep 3 && /usr/bin/dbus-send --type=method_call --dest=org.gnome.ScreenSaver /org/gnome/ScreenSaver org.gnome.ScreenSaver.SetActive boolean:false

ttys3

package main

import (
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
)

ttys3

不同分词器在elastic中的实际效果

介绍不同分词器的文章不少，较经典的有BosonNLP 11款开放中文分词引擎大比拼

可惜这11款分词器只有IK和结巴一直在更新elastic的分词器插件，Boson的插件已经很久没更新

所以加上elastic自带的smartcn 也就只有三种分词器可选。

注1：smartcn基于中科院的ictclas 但用的是1.0， 似乎没再更新

ttys3

use std::io::prelude::*;
use std::process::{Command, Stdio};

fn main() {
    let mut child = Command::new("ffmpeg")
        // Overwrite file if it already exists
        .arg("-y")
        // Interpret the information from stdin as "raw video" ...
        .arg("-f")
        .arg("rawvideo")