chmod ug+s

 How to use write set uid or set gid? 

Very simple example: 

 

 

 

 

chmod +x 2.sh

chmod ug+s 2.sh
-rwsr-sr-x 1 root   root     20 Jul 22 14:08 2.sh

as you see, the ownership is root:

 (but I can run the script via user martin) --- because of chmod ug +s
martin@kirkovalod:~$ ./2.sh
Sat Jul 22 02:09:36 PM CEST 2023
martin@kirkovalod:~$