Linux Basics-18, special permissions S

Special permissions

S

SUID: When running a program, the owner of the corresponding process is the owner of the program file itself, not the initiator

chmod u+s File

chmod u-s File

How the file itself has execute permission, suid display as S, otherwise display s

SGID: When you run a program, the owning group of the corresponding process is the group of the program file itself, not the base group to which the initiator belongs

chmod g+s File

chmod g-s File

Sticky: In a common directory, each can be used to create files, delete their own files, but can not delete other people's files

chmod o+t dir

chmod o-t dir

SUSGST:000 001 010 011 100 101 110 111

File system access list

Facl:filesystem Access Control List

Save additional access control permissions with file extensions

Getfacl

Setfacl

-M

u:username:rw-

g:groupname:rw-

-X: Cancel Permissions

U:username

G:groupname

[Email protected] backup]# setfacl-m U:APACHE:RW inittab

[Email protected] backup]# Getfacl Inittab

# File:inittab

# Owner:root

# Group:root

user::rw-

user:apache:rw-

group::r--

mask::rw-

other::r--

[Email protected] backup]# setfacl-m U:GROUPNAME:RW inittab

Owner-group-other

Owner-facl User-group-facl Group-other

This article is from the "James Zhan Linux Advanced ops" blog, so be sure to keep this source http://jameszhan.blog.51cto.com/10980469/1876339

Linux Basics-18, special permissions S