What does $# mean in shell? As terminated by a custom string @ in this case), and <<< to pass. When going through one shell script, i saw the term $?.
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It seems < is for passing file (or directory), << @ for passing multiple lines (similar to the banner command in cisco switches; 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. What is the significance of this term?
