Tell the differences between Unix and Linux. Then please list some operating sys

Question

Tell the differences between Unix and Linux. Then please list some operating systems (at least three) which belong to Unix but not Linux. What is the pipe mechanism in UNIX? And show one command using pipe and explain how the pipe works in it? In a Linux system, you can issue the command Is/to check the sub- directories under root. Please describe the meanings of directory /bin, /dev, /boot, /usr, /etc, /mnt, /sbin, /var separately. For example, you can say that /bin contains binary executable files. What is the meaning of Multitask and Multi-user in a Unix system? What does GNU stand for? What is the GNU project? Which organization funded the development of GNU project? In class, you have learned the meaning of read, write and execute permission for regular file. However, these permissions are also applied to directories. So please describe the meaning of read, write, and execute permission for directory.

Explanation / Answer

[1]
Linux is shared using the Licensing of the GNU while UNIX is proprietary. Linux is a good desktop OS while UNIX lacks the user friendliness needed for general computing. UNIX is intended for mainframes and high end computers and cannot run on mos PCs while Linux can go from mainframes down to low end personal computers.The Source Code of Linux is freely available to its Users where as in Unix is not available for the general public.Unix is not portable but Linux is portable.
OS : BSD-derived operating systems: FreeBSD, NetBSD, OpenBSD, Mac OS X.

[2]
A pipe is a form of redirection that is used in Linux and other Unix-like operating systems to send the output of one program to another program for further processing.A pipe is designated in commands by the vertical bar character, which is located on the same key as the backslash .
Command :
ls -al | more

[3]
/bin
This is where the executable files are located. These files are available to all users
/dev
These are device drivers
/etc
Supervisor directory commands, configuration files, disk configuration files, valid user lists, groups, ethernet, hosts, where to send critical messages
/lib
Contains shared library files and sometimes other kernel-related files
/boot
Contains files for booting the system
/home
Contains the home directory for users and other accounts
/mnt
Used to mount other temporary file systems, such as cdrom and floppy for the CD-ROM drive and floppy diskette drive, respectively
/proc
Contains all processes marked as a file by process number or other information that is dynamic to the system
/tmp
Holds temporary files used between system boots
/usr
Used for miscellaneous purposes, and can be used by many users. Includes administrative commands, shared files, library files, and others
/var
Typically contains variable-length files such as log and print files and any other type of file that may contain a variable amount of data

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