Error Control Flow Control Line Discipline
Error Control Flow Control Line Discipline
Ubuntu is a free, supported debian/linux implementation of Unix. As such, you can do nearly anything that you can do in Unix in Ubuntu.
The primary function of Unix is the same as it would be for an Operating System - to manage resources and provide security.
the functions and applications of mechanical engineering to other field of discipline
The reason for the exec functions being same/similar is because the Mac OS has its roots in variants of the Unix kernel.
Several different versions of UNIX have GUI's or Graphical User Interfaces. The most common example of UNIX with an interface is Mac OS X.
Yes, Unix has several variants of Graphical User Interfaces that may be used instead of the command line if the user wishes it.
maintenance, publication, supply
The poll-and-select line discipline method is characterized by each device on the network being polled in sequence by a master device. The master device selects a device to communicate with based on the order established during polling. This method is efficient for simple networks but may become slow and inefficient as the number of devices increases.
The usual difficulty that people report concerning UNIX is the use of the command line. The command line has a lot of power and the commands may seem somewhat arcane at times. Like anything else, you have to study what the commands do and how to use them to harness the power of UNIX, but once you do that it isn't that difficult to use.
With OS-dependent library functions. In unix it can be 'fork', in Windows, 'CreateProcess'.