Special privilege bits in Linux

Special permissions:
Passwd: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 FileName, if file has Execute permission is shown as lowercase s, otherwise uppercase S is displayed;
        chmod u-s FileName,
SGID: When running a program, the group of the corresponding process is the genus of the program file itself, not the basic group to which the launcher belongs;
        chmod g+s FileName,
        chmod g+s FileName,
Sticky: In a common directory, each can create files, delete their own files, but can not delete other people's files;
        chmod o+t DIR
        chmod o-t DIR


---    ---   ---    ---
SUID Owner Group Other
Sgid
Sticky

Special privilege bits in Linux