Day2 Linux登录和操作（个人理解简易版）

pwd # 显示当前路径
bio02@ecm-cefa:~$ pwd
/home/bio02

mkdir # 创建目录
bio02@ecm-cefa:~$ mkdir hello #新建hello目录

ls # 显示列表
bio02@ecm-cefa:~$ ls
biosoft  hello  project  src  tmp #除了四个已有目录，新增一个hello目录

rm # 删文件
rmdir # 删空目录
rm -r # 删非空目录（删除统一展示了，如下，因为不会随意切换目录，导致删除要挨个进入目录删）
bio02@ecm-cefa:~$ rm -r tmp
bio02@ecm-cefa:~$ mkdir tmp
bio02@ecm-cefa:~$ cd tmp
bio02@ecm-cefa:~/tmp$ mkdir rm\_test
bio02@ecm-cefa:~/tmp$ cd rm\_test
bio02@ecm-cefa:~/tmp/rm\_test$ mkdir huahua
bio02@ecm-cefa:~/tmp/rm\_test$ cd huahua
bio02@ecm-cefa:~/tmp/rm\_test/huahua$ touch doodle.txt
bio02@ecm-cefa:~/tmp/rm\_test/huahua$ rm doodle.txt
bio02@ecm-cefa:~/tmp/rm\_test/huahua$ cd
bio02@ecm-cefa:~$ cd tmp
bio02@ecm-cefa:~/tmp$ cd rm\_test
bio02@ecm-cefa:~/tmp/rm\_test$ rmdir huahua
bio02@ecm-cefa:~/tmp/rm\_test$ cd
bio02@ecm-cefa:~$ cd tmp
bio02@ecm-cefa:~/tmp$ rmdir rm\_test
bio02@ecm-cefa:~/tmp$ 

cd # 进入目录
bio02@ecm-cefa:~$ cd tmp

vi # 建脚本或文档
bio02@ecm-cefa:~/tmp/new$ vi hello\_world.txt

cat # 查看文档并展示到屏幕
bio02@ecm-cefa:~/tmp/new$ cat hello\_world.txt
i today is a good day,i meet my boyfriend,he is older than me,he finished his work then meet me.we have a good time.

head # 输出前十行（然而我只发挥了一行）
bio02@ecm-cefa:~/tmp/new$ head hello\_world.txt
i today is a good day,i meet my boyfriend,he is older than me,he finished his work then meet me.we have a good time.

tail # 输出后十行（如上括号所言）
bio02@ecm-cefa:~/tmp/new$ tail hello\_world.txt
i today is a good day,i meet my boyfriend,he is older than me,he finished his work then meet me.we have a good time.

head -n # 数字 自定义输出几行
bio02@ecm-cefa:~/tmp/new$ head -n 2 hello\_world.txt
i today is a good day,i meet my boyfriend,he is older than me,he finished his work then meet me.we have a good time.

cp # 复制
bio02@ecm-cefa:~/tmp/new$ cp hello\_world.txt hello\_boy

mv # 移动
bio02@ecm-cefa:~/tmp/new$ mv hello\_world.txt tmp
bio02@ecm-cefa:~/tmp/new$