leeboy的linux學習十三環境變數執行個體

來源:互聯網
上載者:User

環境變數和本地變數的區別在於是不是具有繼承性,下面介紹一個環境變數的例子:

exportFather父進程:

#!/bin/sh#father scriptecho "this is the father"FILE="A GOOD MAN"echo "I like the file : $FILE"export FILE     #聲明為環境變數,如果此處不聲明,exportChild無法使用該變數./exportChild   #執行子進程echo "back to father"echo "and the file is : $FILE"

exportChild  子進程:

#!/bin/sh#child fileecho "this is Child"echo "I like my father's file : $FILE"FILE="Child File"           #子進程中修改該環境變數對主進程中沒有影響echo "my file is : $FILE"

執行結果如下:

[root@localhost textFile]# ./exportFather this is the fatherI like the file : A GOOD MANthis is ChildI like my father's file : A GOOD MANmy file is : Child Fileback to fatherand the file is : A GOOD MAN//環境變數在子進程中修改但父進程中沒有變化

 如果我想在子進程中修改的環境變數也能影響到主進程的改環境變數,該如何做呢?望大牛指導!

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