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              Linux進程管理之runlevel命令命令解析【每日一個知識點第144期-Linux】

              使用Linux系統必備的技能之一就是Linux進程管理,系統運行的過程正是無數進程在運行的過程。這些進程的運行需要占用系統的內存等資源,做好系統進程的管理,對于我們合理分配、使用系統資源有非常大的意義。今天我們來看進程管理命令中的killall命令。


              runlevel命令用于打印當前Linux系統的運行等級。

              語法

              runlevel

              知識擴展

              linux操作系統自從開始啟動至啟動完畢需要經歷幾個不同的階段,這幾個階段就叫做runlevel,同樣,當linux操作系統關閉時也要經歷另外幾個不同的runlevel,下面我們就準備詳細介紹一下runlevel,并向您展示一些小技巧來讓您的linux系統避免不必要的重啟動。

              runlevel可以認為是系統狀態,形象一點,您可以認為runlevel有點象微軟的windows操作系統中的Normal,safemode,和command?prompt only。進入每個runlevel都需要啟動或關閉相應的一系列服務(services),這些服務(services)以初始化腳本的方式放置于目錄/etc/rc.d/rc?.d/或者/etc/rc?.d下面(?代表runlevel的對應序號)。

              在大多數的linux發行版本中,通常有8個runlevel:

              0 停機
              1 單用戶模式
              2 多用戶,沒有 NFS
              3 完全多用戶模式
              4 沒有用到
              5 圖形界面
              6 重新啟動
              S s Single user mode

              多數的桌面的linux系統缺省的runlevel是5,用戶登陸時是圖形界面,而多數的服務器版本的linux系統缺省的runlevel是3,用戶登陸時是字符界面,runlevel 1和2除了調試之外很少使用,runlevel s和S并不是直接給用戶使用,而是用來為Single user mode作準備。

              linux的運行模式比起windows的啟動模式的優勢在于:你可以在系統空閑時使用init命令切換你現在使用的runlevel,另外,當你關閉或者啟動linux系統時你已經不知不覺中切換你的runlevel,系統關機進程需要調用runlevel(0或6)來關閉所有正在運行中的進程。


              《Linux學習每日一個知識點》欄目是馬哥教育Linux云計算年薪20萬+的學員社群特別發起,分享Linux工具、Linux語法、Linux項目等知識點,幫助大家快速的了解Linux學習,快速步入Linux高薪的快車道。

              【超全整理】《Linux云計算從入門到精通》linux學習入門教程系列實戰筆記全放送

               

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