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
