Set UID, set GID, Sticky Bit in Linux

Set UID:

SUID permissions are valid only for binary programs

Performer must have X executable permission for the program

This permission is valid only in the course of executing the program

Performer will have permission to host the program

Such as:

-rwsr-xr-x. 1 root root 27832 June 2014/bin/passwd

Set GID:

Sgid useful for binary programs and directories

Program performer requires x permission for the program

The performer will receive support for the program group during execution

Users can enter this directory if they have r and X permissions for this directory

A valid group of users in this directory will become a group of that directory

Sticky Bit

This is currently only valid for the directory and the file is invalid.

When a user has w,x permissions on this directory, they also have write permissions

When a user creates a file or directory under that directory, only himself and root can delete the file or directory

Such as:

DRWXRWXRWT. 11514 root root 516096 Dec 15:22 tmp

4 for Suid

2 for Sgid

1 for Sbit

Set UID, set GID, Sticky Bit in Linux