What can 755,775,777 do?

Read = 4 write = 2 execute =1read+write+execute = 4+2+1= 7 Here, reading, writing and executing all refer to the user's permission to operate the file, and then the three numbers correspond to the user to which the file belongs and the user group to which the file belongs. Other user groups suggest learning basic user knowledge of unix. Root is the superuser. Generally, it is not affected by file setting permissions (unless the file writing script is executed to prevent root from using it), but the iphone is usually an ordinary user, so it is affected by permissions [this post was last edited by Lucky_gjy on August 22nd, 2008 14: 33].