When going through one shell script, i saw the term $?. 它是操作系统的命令行接口，允许您根据自己的条件执行任何类型的操作。 此外，linux shell不仅是一个接口，而且是一种具有自己的语法和语义集的成熟脚本语言。 常用的linux shell 1.
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