Welcome to Linux Knowledge Base and Tutorial
"The place where you learn linux"
Mercy Corps

 Create an AccountHome | Submit News | Your Account  

Tutorial Menu
Linux Tutorial Home
Table of Contents

· Introduction to Operating Systems
· Linux Basics
· Working with the System
· Shells and Utilities
· Editing Files
· Basic Administration
· The Operating System
· The X Windowing System
· The Computer Itself
· Networking
· System Monitoring
· Solving Problems
· Security
· Installing and Upgrading
· Linux and Windows

Glossary
MoreInfo
Man Pages
Linux Topics
Test Your Knowledge

Site Menu
Site Map
FAQ
Copyright Info
Terms of Use
Privacy Info
Disclaimer
WorkBoard
Thanks
Donations
Advertising
Masthead / Impressum
Your Account

Communication
Feedback
Forums
Private Messages
Surveys

Features
HOWTOs
News Archive
Submit News
Topics
User Articles
Web Links

Google
Google


The Web
linux-tutorial.info

Who's Online
There are currently, 69 guest(s) and 0 member(s) that are online.

You are an Anonymous user. You can register for free by clicking here

  

rootflags




SYNOPSIS

       rdev [ -rvh ] [ -o offset ] [ image [ value [ offset ] ] ]
       rdev [ -o offset ] [ image [ root_device [ offset ] ] ]
       ramsize [ -o offset ] [ image [ size [ offset ] ] ]
       vidmode [ -o offset ] [ image [ mode [ offset ] ] ]
       rootflags [ -o offset ] [ image [ flags [ offset ] ] ]


DESCRIPTION

       With no arguments, rdev outputs an /etc/mtab line for  the
       current  root  file  system.   With no arguments, ramsize,
       vidmode, and rootflags print usage information.

       In a bootable image for the Linux kernel  on  i386,  there
       are  several pairs of bytes which specify the root device,
       the video mode, and the size of the RAM disk.  These pairs
       of bytes, by default, begin at offset 504 (decimal) in the
       kernel image:

               498 Root flags
              (500 and 502 Reserved)
               504 RAM Disk Size
               506 VGA Mode
               508 Root Device
              (510 Boot Signature)

       rdev will change these values.

       Typical  values  for  the  image  parameter,  which  is  a
       bootable Linux kernel image, might be:

              /vmlinux
              /vmunix
              /boot/bzImage-2.4.0
              /dev/fd0
              /dev/fd1

       When  using  the  rdev  command, the root_device parameter
       might be something like:

              /dev/hda1
              /dev/hdf13
              /dev/sda2
              /dev/sdc4
              /dev/ida/c0d0p1

       One may also specify the device by a comma-separated  pair
       of decimal integers major,minor.

       For  the ramsize command, the size parameter specifies the
       size of the RAM disk in kilobytes.

               n = as if "n" was pressed at the prompt

       If  the value is not specified, the image will be examined
       to determine the current settings.


OPTIONS

       -r     Causes rdev to act like ramsize.

       -R     Causes rdev to act like rootflags.

       -v     Causes rdev to act like vidmode.

       -h     Provides help.


BUGS

       The rdev utility, when used other than to find a name  for
       the  current root device, is an ancient hack that works by
       patching a kernel image at a magic offset with magic  num­
       bers.  It  does not work on architectures other than i386.
       Its use is strongly discouraged. Use a  boot  loader  like
       SysLinux or LILO instead.


HISTORY

       At  offset  502  there used to be the device number of the
       swap device (in Linux 0.12), and "rdev  -s"  or  "swapdev"
       would  set  this.  However, since Linux 0.95 this constant
       is not used any longer, and the swap device  is  specified
       using the swapon() system call.


AUTHORS

       Originally by Werner Almesberger (almesber@nessie.cs.id.ethz.ch)
       Modified by Peter MacDonald (pmacdona@sanjuan.UVic.CA)
       rootflags support added by Stephen Tweedie (sct@dcs.ed.ac.uk)

Linux 0.99               20 November 1993                 RDEV(8)
  




Login
Nickname

Password

Security Code
Security Code
Type Security Code


Don't have an account yet? You can create one. As a registered user you have some advantages like theme manager, comments configuration and post comments with your name.

Help if you can!


Amazon Wish List

Did You Know?
The Linux Tutorial can use your help.


Friends



Tell a Friend About Us

Bookmark and Share



Web site powered by PHP-Nuke

Is this information useful? At the very least you can help by spreading the word to your favorite newsgroups, mailing lists and forums.
All logos and trademarks in this site are property of their respective owner. The comments are property of their posters. Articles are the property of their respective owners. Unless otherwise stated in the body of the article, article content (C) 1994-2013 by James Mohr. All rights reserved. The stylized page/paper, as well as the terms "The Linux Tutorial", "The Linux Server Tutorial", "The Linux Knowledge Base and Tutorial" and "The place where you learn Linux" are service marks of James Mohr. All rights reserved.
The Linux Knowledge Base and Tutorial may contain links to sites on the Internet, which are owned and operated by third parties. The Linux Tutorial is not responsible for the content of any such third-party site. By viewing/utilizing this web site, you have agreed to our disclaimer, terms of use and privacy policy. Use of automated download software ("harvesters") such as wget, httrack, etc. causes the site to quickly exceed its bandwidth limitation and are therefore expressly prohibited. For more details on this, take a look here

PHP-Nuke Copyright © 2004 by Francisco Burzi. This is free software, and you may redistribute it under the GPL. PHP-Nuke comes with absolutely no warranty, for details, see the license.
Page Generation: 0.11 Seconds