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Top Forums UNIX for Dummies Questions & Answers Having difficulty with UNIX concept. Please help! Post 302102468 by ALon on Wednesday 10th of January 2007 04:02:17 PM
Old 01-10-2007
Having difficulty with UNIX concept. Please help!

Hi,

I would be very happy if someone could help me please. I am relatively new to UNIX, and still learning.

My understanding of things are:
Say I have a PC running Windows. This machine has a name. If I have 10 PC's, then I have 10 names, one for each PC. Each PC is independent of the other. It is a separate entity. Each has it's own file system, CPU, RAM, harddrive etc...

Now, considering UNIX...
At university there are about 50 machines in the lab. Each is a box, with a label on it stating its hostname e.g abc.def.ac.uk.
So I am assuming that each is a machine in its own right, yes? i.e. if we were to open the box, inside each machine will have its own CPU, own RAM, own motherboard etc. Is this correct?
Now how does the UNIX bit come in? It says that UNIX is supposed to be "multi user, multi tasking, time sharing". Does this simply mean that some other user too can remotely log into that box and use it to do their work?

Now for the other question. If I sit at machine 1, and create a file, and then I log out, and log in on machine 5, then that file is visible. Does this mean that when I created that file, it was not created on the harddrive of machine 1, but rather on a big hard drive inside the server room?

So, I am very confused here. There seem to be many directory structures, one somewhere in a server room which stores everything, and one on each box where the UNIX O/S is stored.

Someone please address what I am asking using simple, laymen terms.

Thanks a lot.

A

Last edited by ALon; 01-10-2007 at 05:08 PM..
 

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recserv(1M)															       recserv(1M)

NAME
recserv - HP SharedX Receiver Service SYNOPSIS
/usr/lbin/recserv DESCRIPTION
HP SharedX Receiver Service provides a method for a receiver to allow the sharing of windows without explicitly performing any xhost com- mands. The Internet daemon (inetd(1M)) executes recserv when it receives a service request at the port listed in the services data base for recserv (see inetd(1m) and services(4)). When recserv is executed via inetd, a dialog box appears informing the receiver of the share request by the sender. The receiver can allow or disallow the share request by selecting the YES or NO button. recserv allows sharing by xhosting the sender just long enough for it to make a connection to the receiver. Once the connection is estab- lished recserv removes the sender from the access control list, unless the sender was entered in the list prior to the execution of rec- serv. Since no permanent change is made to the access control list, security is maintained at its highest level. To start recserv from the Internet daemon, the configuration file /etc/inetd.conf must include the single line entry, recserv stream tcp nowait bin /usr/lbin/recserv recserv -display :0 If the sharing is going to be done between IPv6 machines, the protocol field of the above entry in /etc/inetd.conf file of the receiver machine should be changed to tcp6 as follows recserv stream tcp6 nowait bin /usr/lbin/recserv recserv -display :0 and the services file /etc/services must include the line, recserv 7815/tcp # SharedX Receiver Service Receiver Service options, set by selecting the Options button, dictate the behavior of recserv. The behavior can also be set by running recserv manually. In either case, an X server resource is set dictating the behavior for subsequent invocations of recserv. OPTIONS
The following options allow different behavior according to user preferences. AlwaysAsk The dialog will pop up each time sharing is requested, regardless of the security on your X server. AlwaysAllow The dialog box never appears, but sharing will always be allowed. AskUnhosted The dialog will pop up only if the sender's machine is not hosted on your machine. If the sender's machine is already hosted, sharing will occur without a dialog appearing. NeverAsk The dialog will never appear. Windows are shared only if the sender's machine is already hosted by your server. To set resources (system behavior, label strings, etc) globally for a system, edit the file /usr/lib/X11/app-defaults/RecServ. AUTHOR
HP SharedX Receiver Service was developed by Hewlett Packard. SEE ALSO
SharedX(1), inetd(1M), xhost(1), hosts(4), inetd.conf(4), inetd.sec(4), services(4). recserv(1M)
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