[TOC] ## 環境變量 變量LINENO返回它在腳本里面的行號。 ``` #!/bin/bash echo "This is line $LINENO" ``` 輸出 ``` $ ./test.sh This is line 3 ``` ## BASH_SOURCE 變量BASH_SOURCE返回一個數組，內容是當前的腳本調用堆棧。 該數組的0號成員是當前執行的腳本，1號成員是調用當前腳本的腳本， <details> <summary>lib1.sh</summary> ``` #! /bin/bash source lib2.sh function func1() { func2 } ``` </details> <br /> <details> <summary>lib2.sh</summary> ``` #!/bin/bash function func2() { echo "func2: BASH_SOURCE0 is ${BASH_SOURCE[0]}" echo "func2: BASH_SOURCE1 is ${BASH_SOURCE[1]}" echo "func2: BASH_SOURCE2 is ${BASH_SOURCE[2]}" } ``` </details> <br /> </details> <br /> <details> <summary>main.sh</summary> ``` #!/bin/bash source lib1.sh func1 ``` </details> <br /> 輸出 ``` func2: BASH_SOURCE0 is lib2.sh func2: BASH_SOURCE1 is lib1.sh func2: BASH_SOURCE2 is main.sh ```