In this lesson, I will introduce your first three commands: PWD (print working directory), CD (change directory), and ls (list files and directories).

在这一节，我会首先向你介绍三个命令：pwd(打印当前工作目录)，cd(改变目录)，还有ls(显示出文件和目录)。

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Listing 1 shows the use of the PWD command, and three different ways to use the ls command to list the files in this directory.

清单1展示了pwd命令的使用，以及通过三种不同的方法使用ls命令列出此目录中的文件。

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This paper firstly discusses three types of parallelism in LS SIMD array microprocessor, they are the concurrence of data, the pipelining and the operation in parallel.

首先介绍了L S SIMD阵列微处理器的三种并行性：数据并行、流水线并行和指令的并行执行。

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