In Linux, normally a file has permissions to read, write, and execute. Apart from these permissions, it can also have special permissions such as SUID (Set owner User ID) and SGID. Due to these permissions, it is possible for a user to log in from their account and still run a particular file/program with the permissions of the actual file owner (which can be root also). sXid is the tool for monitoring SUID/SGID on a regular basis. Using this tool, we can track changes in the SUID/SGID of files and folders.