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Created June 22, 2014 12:35
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script running
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script.md

如何判断脚本是以独立进程运行的，还是被source命令调用的？
方法1: 可以查看$0变量的值，如果是以source运行，$0应该为bash或sh.
方法2: 可以查看ps -o comm= -p $$的输出，也就是打印当前进程的命令，输出洁果和方法1是一样的。

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