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

 Create an AccountHome | Submit News | Your Account  

Tutorial Menu
Linux Tutorial Home
Table of Contents
Up to --> System Monitoring

· Finding Out About Your System
· Hardware and the Kernel
· Terminals
· Hard Disks and File Systems
· User Files
· Network Files
· Important System Files

Man Pages
Linux Topics
Test Your Knowledge

Site Menu
Site Map
Copyright Info
Terms of Use
Privacy Info
Masthead / Impressum
Your Account

Private Messages

News Archive
Submit News
User Articles
Web Links


The Web

Who's Online
There are currently, 73 guest(s) and 0 member(s) that are online.

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

Linux Tutorial - System Monitoring - Finding Out About Your System - Terminals
  Hardware and the Kernel ---- Hard Disks and File Systems  


Each line in /etc/inittab that refers to a terminal device points to an entry in the /etc/gettydefs file. The entry for the COM1 port (/dev/ttyS1) might look like this:

S1:234:respawn:/etc/getty ttyS1 M19200

From our discussion of the /etc/inittab file in the section on starting and stopping the system, you see that this entry starts the /etc/getty command. Two arguments are passed to getty: the terminal on which it should run (ttyS1) and the gettydefs entry that should be used (m). The /etc/gettydefs file defines such characteristics as the default speed, parity, and the number of data bits. For example, the m entry, to which the previous inittab entry points, might look like this:

M19200 # B19200 CS8 CLOCAL # B19200 SANE -ISTRIP CLOCAL #@S login: # M19200

The fields are

label # initial_flags # final_flags #login_prompt # next_label

The label entry is what is being pointed to in the inittab file. The initial_ flags are the default serial line characteristics that are set, unless a terminal type is passed to getty. Normally, the only characteristic that needs to be passed is the speed. However, we also set HUPCL (hang up on last close).

The final_flags are set just before getty executes login. Here again, set the speed and HUPCL. However, we also set the terminal to SANE, which is actually several characteristics. (Look at the gettydefs man-page for more details.) We also set TAB3, which turns tabs into space; ECHOE, which echoes the erase character as a backspace-space-backspace combination; and IXANY, which enables any character to restart output if it is stopped by the XOFF character.

 Previous Page
Hardware and the Kernel
  Back to Top
Table of Contents
Next Page 
Hard Disks and File Systems


Test Your Knowledge

User Comments:

You can only add comments if you are logged in.

Copyright 2002-2009 by James Mohr. Licensed under modified GNU Free Documentation License (Portions of this material originally published by Prentice Hall, Pearson Education, Inc). See here for details. All rights reserved.
Show your Support for the Linux Tutorial

Purchase one of the products from our new online shop. For each product you purchase, the Linux Tutorial gets a portion of the proceeds to help keep us going.



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?
You can choose larger fonts by selecting a different themes.


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