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<>最简单的命令：
关键词：date cal pwd cd ls mkdir rmdir cp cat diff head tail wc(word count)
* 目前时间
dl@dl-virtual-machine:~$ date
* 目前日期
dl@dl-virtual-machine:~$ cal
* 指定年份的日历（显示全年）
dl@dl-virtual-machine:~$ cal 2020
* 指定月份的日历（显示月份）
dl@dl-virtual-machine:~$ cal 1 2020
* 查看目前所处文件夹
dl@dl-virtual-machine:~$ pwd
* 查看所处文件夹所包含的文件
dl@dl-virtual-machine:~$ ls
* 查看多处文件夹所包含文件的详细信息
dl@dl-virtual-machine:~$ ls -l
* 跳到总目录下
dl@dl-virtual-machine:~$ cd /
* 跳到指定文件夹(home)下
dl@dl-virtual-machine:~$ cd home
* 退回到上一层(文件夹)
dl@dl-virtual-machine:~$ cd ..
* 在所处位置新建文件夹
dl@dl-virtual-machine:~$ mkdir cc(文件夹名)
* 清除创建的文件夹(不能跨文件夹删除)
dl@dl-virtual-machine:~$ rmdir cc/(文件夹名)
* 复制文件为另一个
dl@dl-virtual-machine:~$ cp -r cc(所复制的文件名) cc1(复制后起的文件名 / 将前面文件夹复制在这个文件夹下面)
* 查看文件的内容
dl@dl-virtual-machine:~$ cat 文件名( - 开头的可以 cat)
* 比较两个文件
dl@dl-virtual-machine:~$ diff 文件夹1 文件夹2
相同：
不相同：
* 查看文件的文件头(所规定的前几行)
dl@dl-virtual-machine:~$ head 文件名 -n 5
* 查看文件的后几行
dl@dl-virtual-machine:~$ tail 文件名 -n 5
* 统计 行数 单词 字符数
dl@dl-virtual-machine:~$ wc 文件名
* 只统计行数
dl@dl-virtual-machine:~$ wc -l 文件名
* 只统计单词数
dl@dl-virtual-machine:~$ wc -w 文件名
* 只统计字符数
dl@dl-virtual-machine:~$ wc -c 文件名
* 屏幕清空
dl@dl-virtual-machine:~$ clear
