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Old 06-23-2009, 03:51 AM   #1
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Basic linux questions

1> What is the difference between UNIX and LINUX ?

2> What is the difference between virtual memory and swap space?

3> What is the difference between antivirus and firewall?

4> What is the purpose of /proc file system?
Old 06-23-2009, 03:52 AM   #2
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search google may be you can get better idea about these

Last edited by kirukan; 06-23-2009 at 03:54 AM.
Old 06-23-2009, 04:00 AM   #3
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i did but i cant get the exact answers.
so wud u please help me out?
Old 06-23-2009, 04:16 AM   #4
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Unix v Linux...

Virtual memory is a system that is totally integrated into the system and can never be disabled. Applications never access physical memory directly but only through the memory management hardware of the processor. Virtual memory is essentially a marriage of the processor, physical memory, and the disk drive. Frequently accessed data is stored in RAM with the remainder on disk. By this means the system provides a virtual environment to applications that is independent of physical resources. A system with more RAM will perform better because more data can be stored in the faster physical memory. The complete virtual memory system is totally transparent to applications.


Overview of Proc

I hope this helps.
Old 06-23-2009, 04:22 AM   #5
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Q) What is the difference between doing homework by yourself and asking people to do your homework for you?
Old 06-23-2009, 04:26 AM   #6
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1.5 What are the differences between Linux and UNIX?

Command-line-wise, almost none, although this has been changing (for better or worse). Linux has a much larger market appeal and following than any commercial UNIX. GUI-wise there are also no major differences--Linux, as most other UNIXes, uses an X-Windowing system.

The major differences:


Linux is free, while many UNICES (this is supposed to be the plural of UNIX), are very expensive. The same for applications--many good applications are available on Linux free. Even the same commercial application (if you wanted to buy one) typically costs much more for a commercial UNIX than for Linux.

Linux runs on many hardware platforms, the commodity Intel-x86/IBM-spec personal computers being the most prominent. In contrast, a typical UNIX is proprietary-hardware-bonded (and this hardware tends to be much more expensive than a typical PC clone).

With Linux, you are in charge of your computer, whereas on most UNICES you are typically confined to be an "l-user" (some administrators pronounce it "loser").

Linux feels very much like DOS/Win in the late 80s/90s, but is much sturdier and richer, while a typical UNIX account feels like a mainframe from the 60s/70s.

Some UNICES may be more mature in certain areas (for example, security, some engineering applications, better support of cutting-edge hardware). Linux is more for the average Joe who wants to run his own server or engineering workstation.


/proc filesystem contains entirely illusionary files. They don't really exist on the disk and don't take up any space there (although ls -l will show their size). When viewing them, you really access information stored in the memory. It is used to access information about the system.

Old 06-23-2009, 05:16 AM   #7
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You will have read the statute of limitations with regard to homework questions; as, by implication, you seem to have admitted that this is homework. So:

1> What is the difference between UNIX and LINUX ?
There is an L in LINUX and not in UNIX. That has a hex value of 4C.

2> What is the difference between virtual memory and swap space?
Too easy; swap space is space that can be used to swap to and virtual memory isn't. (Oh, go on; its memory but it isn't real memory because its virtual.)

3> What is the difference between antivirus and firewall?
Well the answer to this should be antivirus is against viruses and a firewall is against fires, but it isn't. The first of those is correct, but the second is more metaphorical, as fire itself doesn't move down cables particularly well.

4> What is the purpose of /proc file system?
I'm afraid that here I have failed to find a flip answer for you. The best I can say is that on a system on which everything is a file, if you have a system in which are trying to organise things the organisation is going to have to be representable as a filesystem, isn't it? So it couldn't really have been anything else and fulfilled its purpose within the philosophy of the system.

Please note that homework is not 'banned', but if you want helpful answers you will have to say what you have tried, where you are stuck and expect answers that prod you in the right direction rather than anything you can submit to your tutor for points.




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