There are far more system calls (one hundred and forty something at the present time) than I have space to describe in detail here. However, there are still a few more that we should look at before we finish.
All the commands that can be executed from a shell command prompt can only perform their operations by calling on some underlying system calls to get the required system services from the operating system. In several cases this means a new system call specifically to provide a particular service.
The next set of system calls is of this type.