Sudo? -I just need to enter the administrator password.

2. The easiest way to open a directory in a terminal is:

First enter it at the terminal.

Cdcd is followed by a space, then open the parent directory of the required file in Finder, select the folder to open and drag it to the terminal, as shown in the figure, the directory will be pasted automatically, and then enter the directory.

Modify document permissions in linux, the first time to use.

ls？ -l displays all file attributes in the current directory (you can see the permissions).

Just use chown to modify it.