The alias system works best where you want to set the command-line options on an individual command, although they can be used to expand a given command into a set of multiple commands, or pipes.
别名机制最适合于您希望设置单个命令的命令行选项的情况，虽然也可以使用它们来将给定的命令展开为一组命令或管道。
When you type ll, it's replaced by its alias, and any remaining command-line arguments are appended.
当您输入ll时，它会被其别名替换，并且附加上剩下的命令行参数。
Functions are callable from the command line, too, and fill the gap between an alias and a full-blown script.
函数也可以从命令行调用，它们填补了别名与完全成熟的脚本之间的空缺。
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