今天分享如何搜尋字串裡面的 substring 或如果有檔案(log)想找相關字來做分析。

split() 方式

我的 string 是:

st="[20221013.162853.788442][info]:[>>> DL- ingress traffic: 0.010799(Mbps), egress traffic: 0.087016(Mbps), ReTx: 0.000220(Mbps)]"

我想抓出時間和TPUT的直，如:
[20221013.162853.788442] 和 0.010799(Mbps) 同時要把 [] 和 (Mbps)移除，可以用下面方式:

• Step1: 宣告我的 string

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st="[20221013.162853.788442][info]:[>>> DL- ingress traffic: 0.010799(Mbps), egress traffic: 0.087016(Mbps), ReTx: 0.000220(Mbps)]"

• Step2 抓取時間直

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dateStr = st.split('[', 1)[1].split(']')[0]
print(dateStr) #20221013.162853.788442

output:

20221013.162853.788442

Open Read Write File

open syntax:　

open( file, mode, encoding="utf-8")

Read

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fileObj = open("路徑檔名" , "r", encoding="utf-8") 
content = fileObj.read( ) 
fileObj.close( )

Write

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fileObj = open("路徑檔名" , "w", encoding="utf-8")
fileObj.write(輸出資料)
fileObj.close( ) 

Example

Ex1. read file and print

Interview Code Test

I am sharing some Code Test during my Interview, and also some practice Code example.
今天分享我一些Live Coding 面試問題，還有一些刷題的問題。

Amazon Live Code

Q1. read file into datastucture and search like logfile

If we have a log.txt, as below, you need to and search specfic string, like cat.

• log.txt

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  1 cat 2 lion 3 apple

Answer 1: list

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with open("log.txt", "r") as textfile:
   lines = textfile.readlines()
for i in lines:
    sli = i.split(' ')
    #print(sli)
    if "cat" in sli:
        print(sli[0], sli[-1])

Answer2: using dictionary

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d={}
with open("log.txt", "r") as textfile:
   #lines = textfile.readlines()
#skip \n
   lines = textfile.read().splitlines()
   #print(lines)   
for i in lines:
    #sli = i.split(' ')    
    (key,val)=i.split(" ")
    d[int(key)]=val
   # print(key,"",val)
print(d)

Advance JS

構造函數constructor Function

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function createCard(initName){
this.name=initName

}

const a1 = new createCard("Ma")
const a2 = new createCard("Ma2")
const a3 = new createCard("Ma3")
const a4 = new createCard("Ma4")
const a5 = new createCard("Ma5")
console.log(a1)
console.log(a2)
console.log(a3)

output

createCard { name: ‘Ma’ }
createCard { name: ‘Ma2’ }
createCard { name: ‘Ma3’ }

array function =>

In ES6 there is a new function called array function, which you can write shorter function.

Before ES6

function hello(){}

after ES6

let hello = function (){}
shorthand
let hello = () =>{}

function without passing paramter

Before ES6 (normal function)

ex: function hello(){}

今天我想分享如何用linux shell script 語法。
我們需要加這個在script裡面，然後檔案改成.sh

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#! /bin/bash

• How to execute script

  chmod 777 myscript.sh
./myscript.sh

1. variable

define variable

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text1=Hello
name=CC
echo $text1 $name

output:

Hello CC

read and echo variable

read variable

read a

read vairable without skip new line:

read -p “Your Options: “ option

alias

Method 1: put your alias in .alias_pofile

Recommend use this file, will not destory .bashrc file.

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cd ~
touch .alias_pofile

Method 2: edit .bashrc

This method need to reboot to take effect

change directory

change folder or directory

cd : change directory to home ~ directory
cd folder: change to specific directory

change upper directory

1. Print

Ex1 Print Basic Interger and String

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str_name= "hello"
num_value= 999
print(f"str value is {str_name}, and number is {num_value}")

output:

str value is hello, and number is 999

%-formatting-OLD

Example 1 Print String with % Operator

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text = 'world'
print("hello " + text)
print('hello %s' % text)

name = "Test"
num = 100
print("Hello, %s. My num is  %s." % (name, num))

output:

hello world
hello world
Hello, Test. You are 100.

3. str.format()- NEW

str.format() 是對 %-formatting 的改進，可以用函式呼叫語法，可以通過 format() 方法對被轉換為字串的物件

JS基本須知道

How to run JS

• Browser- inspect

  • Method1:

    Go to inspect > console

  • Method 2:

    inspect> sources> snipperts> create js file

• NodeJS environment

  寫 XXX.js//CREATE JS file

  node XXX.js //run .js file using node

adding comment

// single line comment
/**/: multiply line comment

顯示 print

• console.log() 顯示在console
• alert() 跳出顯示
• document.write("\<h1>hello <br\/>")

JS　 基本語法- Part 1

１. declare variable 宣告變數

• let (新)可以取代var

  ex:

  let myName= "chenchih"
console.log(myName)

• var
• const

  must be inital and not able to change
  不被修改變數。如果不想被人修改

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  const test= "heloo" test="world" console.log(test) //error

今天我想寫關於 Markdown相關指令。想信大家都會常用MD或是markdown。

字體效果

斜體字 ==> *文字*
粗體字 ==> **文字**
斜粗體 ==> ***文字***
刪除線strikethrough ==> ~~文字~~
斜體2 ==> _文字_
斜粗2 ==> __文字__
正常^上標^ ==> 文字^string1^
正常下標 ==> 文字~string1~
++底線++ ==> ++文字++
==螢光標記== ==> ==文字==

color顏色

• color ==> <font color="red">text </font>
• Highlighted text => <mark style="background-color: #FFFF00">Highlighted text</mark>

  change mark or span/div

Font Size 大小

• HTML ==> <font size=5> **HTML**</font>

Horizontal Rules

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前言

今天天想分享如何在terminal或終端機變成更有效率或是更美化。我們需要用到zsh 和 ohmysh。

本篇文章會安裝以下套件：

• ubuntu 安裝和設定
  • 基本套件: zsh git wget curl
  • ohymysh套件
  • shell 設定
  • Oh My Zsh 安裝，主題設定
  • 安裝Powerlevel10k 主題，不然會怪怪

更新 ubuntu 套件

$ sudo apt-get update

安裝 zsh

檢查我們目前支援的shells

目前支援的shells
$cat /etc/shells