Linux commands: special permission bits

Special Permissions Introduction to Commands:    

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

If file itself has execute permission, then SUID is displayed as S;

SGID: when running a program, the 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

Develop team, hadoop,hbase, Hive

/tmp/project/

Develop

If file itself has execute permission, then Sgid is displayed as s;

Sticky: in a common directory, each can create files, delete their own files, but not delete others ' files;

chmod o+t dir only for directory settings

chmod o-t dir only for directory settings

If the directory itself has execute permissions, the Sgid is displayed as s;

1 . Command format:

chmod u+s file to set SUID permissions for the main location of the files

chmod u-s file cancels the SUID permissions of the main location of the files

chmod g+s file to set suid permissions for the genus group location of files

chmod g-s file cancels the SUID permissions of the main location of the files

2 . Command function:

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

SGID: when running a program, the group of the corresponding process is the group of the program file itself, not the base group to which the initiator belongs;

Sticky: in a common directory, each can create files, delete their own files, but not delete others ' files;      

3 . Command parameters:

 /

4 . Command instance :

Special permission bits are represented by binary:

000: Indicates no special permission bit

001: Indicates special permissions with sticky

...

the : Indicates a suid SGID

111 : Indicates that three special permission bits have

chmod 5755/backup/test

Umask 0022

Umask number, set default Umask permissions

chmod u+s file sets suid permissions on files, any user has the file owner permission for the file.

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Linux commands: special permission bits