What is the significance of this term? 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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Can you give examples for uses of. What does $# mean in shell? Shell 可直译为“贝壳”，贝壳是动物作为外在保护的一种工具。可以理解为：linux中的 shell就是 linux内核 的一个外层保护工具，并负责完成用户与内核之间的交互。 命令是用户向系统内核发出控制请.
It seems < is for passing file (or directory), << @ for passing multiple lines (similar to the banner command in cisco switches;
As terminated by a custom string @ in this case), and <<< to pass a.
