07-09-2013
Thanks for the suggestions guys,
But the question is still half answered . The application which is running on the server has to be accessed or do any code change in it requires root permissions ,so every of the workstation with Cent OS being accessed is given root permissions and most of the programmers are non linux users who are causing this. Atleast it will be good if i can make a message echo "Please verify your command ".
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LEARN ABOUT SUSE
resizecons
RESIZECONS(8) Console Support RESIZECONS(8)
NAME
resizecons - change kernel idea of the console size
SYNOPSIS
resizecons COLSxROWS
resizecons -lines ROWS
DESCRIPTION
The resizecons command tries to change the videomode of the console. There are several aspects to this: (a) the kernel must know about it,
(b) the hardware must know about it, (c) user programs must know about it, (d) the console font may have to be adapted.
(a) The kernel is told about the change using the ioctl VT_RESIZE. This causes the kernel to reallocate console screen memory for all vir-
tual consoles, and might fail if there is not enough memory. (In that case, try to disallocate some virtual consoles first.) If this
ioctl succeeds, but a later step fails (e.g., because you do not have root permissions), you may be left with a very messy screen.
The most difficult part of this is (b), since it requires detailed knowledge of the video card hardware, and the setting of numerous regis-
ters. Only changing the number of rows is slightly easier, and resizecons will try to do that itself, when given the -lines option. (Proba-
bly, root permission will be required.) The command resizecons COLSxROWS will execute restoretextmode -r COLSxROWS (and hence requires
that you have svgalib installed). Here COLSxROWS is a file that was created earlier by restoretextmode -w COLSxROWS. Again, either root
permissions are required, or restoretextmode has to be suid root.
In order to deal with (c), resizecons does a `stty rows ROWS cols COLS' for each active console (in the range tty0..tty15), and sends a
SIGWINCH signal to selection if it finds the file /tmp/selection.pid.
Finally, (d) is dealt with by executing a setfont command. Most likely, the wrong font is loaded, and you may want to do another setfont
yourself afterwards.
BUGS
resizecons does not work on all hardware. For example, it cannot be used on platforms other than x86 and x86_64. See the fbset(1) program
if you are looking for an alternative.
This command used to be called resize, but was renamed to avoid conflict with another command with the same name.
SEE ALSO
setfont(8), stty(1), selection(1), restoretextmode(8), disalloc(8), fbset(1)
Local 17 Jan 1995 RESIZECONS(8)