List the system calls used for process management

System calls Description

* fork() To create a new process
* exec() To execute a new program in a process
* wait() To wait until a created process completes its execution
* exit() To exit from a process execution
* getpid() To get a process identifier of the current process
* getppid() To get parent process identifier
* nice() To bias the existing priority of a process
* brk() To increase/decrease the data segment size of a process.