SUID, or "Set User ID upon execution," is a permission setting in Unix-like operating systems that allows a program to run with the privileges of its owner, rather than the privileges of the user executing it. This is particularly useful for allowing regular users to execute certain programs that require elevated privileges to perform specific tasks, such as copying files to restricted directories or executing system commands.
For example, a program like cp may need root privileges to copy files to a protected directory. By setting the SUID bit on the cp executable, any user can run it with root privileges, enabling them to perform the necessary operations without needing to log in as the root user.
