performs the analogous tasks using setegid (2), setregid (2), or setresgid (2). A process ... filesystem user (group) ID. setreuid (2) ( setregid (2)) Modify the process's real and…setuid (2), setegid (2), seteuid (2), setregid (2), setreuid (2), setresgid (2), setresuidsystem calls include setgid (2), setfsgid (2), setregid (2), setresgid (2), and setgroups (2). Writing