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              export命令???設置或顯示環境變量【每日一個知識點第353期-Linux】

              export命令???設置或顯示環境變量。(比如我們要用一個命令,但這個命令的執行文件不在當前目錄,這樣我們每次用的時候必須指定執行文件的目錄,麻煩,在代碼中先執行export,這個相當于告訴程序,執行某某東西時,需要的文件或什么東東在這些目錄里)

              語  法:export [-fnp][變量名稱]=[變量設置值]
              補充說明:在shell中執行程序時,shell會提供一組環境變量。 export可新增,修改或刪除環境變量,供后續執行的程序使用。export的效力僅及于該此登陸操作。
              參  數:
              -f  代表[變量名稱]中為函數名稱。
              -n  刪除指定的變量。變量實際上并未刪除,只是不會輸出到后續指令的執行環境中。
              -p  列出所有的shell賦予程序的環境變量。
              一個變量創建時,它不會自動地為在它之后創建的shell進程所知。而命令export可以向后面的shell傳遞變量的值。當一個shell腳本調用并執行時,它不會自動得到原為腳本(調用者)里定義的變量的訪問權,除非這些變量已經被顯式地設置為可用。export命令可以用于傳遞一個或多個變量的值到任何后繼腳本。 —-《UNIX教程》

              startx??在虛擬終端接口輸入命令 startx &,可以啟動圖像界面接口

              寫得不是很完善,有錯的地方請各位朋友幫指正。等到就業班課程看完程后再來個詳細的總結。

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