Each shell has an assortment of built-in commands; the PATH environment variable specifies the list and order of directories to search; and each alias ACTS as shorthand.
每种Shell都有一个内置命令的分类；PATH环境变量用于指定搜索的列表和目录；而别名可以作为简写。
Each shell has an assortment of built-in commands; the PATH environment variable specifies the list and order of directories to search; and each alias ACTS as shorthand.
每种Shell都有一个内置命令的分类；PATH环境变量用于指定搜索的列表和目录；而别名可以作为简写。
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