What commands are used to create directories, files and copy files?

Create directory: mkdir

(Recommended tutorial: linux tutorial)

Create file: typical such as touch, vi You can also create files. In fact, as long as you output to a file that does not exist, the file will be created.

Copy files: cp

Related introduction:

What command is used to modify file permissions? What is the format?

File permission modification: chmod

The format is as follows:

$ chmod u+x file 给 file 的属主增加执行权限
$ chmod 751 file 给 file 的属主分配读、写、执行(7)的权限，给 file 的所在组分配读、执行(5)的权限，给其他用户分配执行(1)的权限
$ chmod u=rwx,g=rx,o=x file 上例的另一种形式
$ chmod =r file 为所有用户分配读权限
$ chmod 444 file 同上例
$ chmod a-wx,a+r file同上例
$ chmod -R u+r directory 递归地给 directory 目录下所有文件和子目录的属主分配读的权限

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