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Some programs in Linux use the SUID or Set User ID permission; this includes programs like /usr/bin/passwd. When the program runs it will run with the permissions of the file's owner and not the current user's permissions. When the and process in Linux run we have REAL UID and an EFFECTIVE UID we can see these values in a simple C program that we can use to demonstrate the use of the SUID permission.
On this page of the site you can watch the video online Linux Permissions and using C programming to understand the SUID bit on the Raspberry Pi with a duration of hours minute second in good quality, which was uploaded by the user theurbanpenguin 06 January 2014, share the link with friends and acquaintances, this video has already been watched 7,914 times on youtube and it was liked by 67 viewers. Enjoy your viewing!