Figure $3\mathrm{.}9.$ Process creation using the

fork$()$ system call.

Figure $3\mathrm{.}7.$ A tree of processes on a

typical Linux system.

In Unix, the first process is called init. All the others are descendants of "init". The init

process spawns a sshd process that detects a new secure ssh requested connection.

Upon a new connection, sshd spawns a login process that then loads a shell on it

when a user successfully logs into the system. Now, assume that the user types

who $|$ grep