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              9個實戰及面試常用Shell腳本編寫

              注意事項

              1)開頭加解釋器:#!/bin/bash

              2)語法縮進,使用四個空格;多加注釋說明。

              3)命名建議規則:變量名大寫、局部變量小寫,函數名小寫,名字體現出實際作用。

              4)默認變量是全局的,在函數中變量local指定為局部變量,避免污染其他作用域。

              5)有兩個命令能幫助我調試腳本:set -e 遇到執行非0時退出腳本,set-x 打印執行過程。

              6)寫腳本一定先測試再到生產上。

              1 獲取隨機字符串或數字

              獲取隨機8位字符串:

              個實戰及面試常用Shell腳本編寫"

              獲取隨機8位數字:

              個實戰及面試常用Shell腳本編寫"

              cksum:打印CRC效驗和統計字節

              2 定義一個顏色輸出字符串函數

              個實戰及面試常用Shell腳本編寫"

              function關鍵字定義一個函數,可加或不加。

              3 批量創建用戶

              個實戰及面試常用Shell腳本編寫"

              4 檢查軟件包是否安裝

              個實戰及面試常用Shell腳本編寫"

              5 檢查服務狀態

              個實戰及面試常用Shell腳本編寫"

              6 檢查主機存活狀態

              方法1: 將錯誤IP放到數組里面判斷是否ping失敗三次

              個實戰及面試常用Shell腳本編寫"

              方法2: 將錯誤次數放到FAIL_COUNT變量里面判斷是否ping失敗三次

              個實戰及面試常用Shell腳本編寫"

              方法3: 利用for循環將ping通就跳出循環繼續,如果不跳出就會走到打印ping失敗

              個實戰及面試常用Shell腳本編寫"

              7 監控CPU、內存和硬盤利用率

              1)CPU

              借助vmstat工具來分析CPU統計信息。

              個實戰及面試常用Shell腳本編寫"

              2)內存

              個實戰及面試常用Shell腳本編寫"

              3)硬盤

              個實戰及面試常用Shell腳本編寫"

              8 批量主機磁盤利用率監控

              前提監控端和被監控端SSH免交互登錄或者密鑰登錄。

              寫一個配置文件保存被監控主機SSH連接信息,文件內容格式:IP User Port

              個實戰及面試常用Shell腳本編寫"

              9 檢查網站可用性

              1)檢查URL可用性

              個實戰及面試常用Shell腳本編寫"

              2)判斷三次URL可用性

              思路與上面檢查主機存活狀態一樣。

              個實戰及面試常用Shell腳本編寫"

              本章寫的Shell腳本例子都比較實用,在面試題中也經常出現,希望大家參考著多動手寫寫,不要復制粘貼就拿來跑,這樣是學不會的!

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              郵件:work@magedu.com

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