08-19-2009
Newbie at Linux Kernel programming!
Hi Friends,
This is my first ever post on this forum. I am a new user in the Linux field. Although, I have been working for sometime with CentOS at my work, I would consider myself an amateur only in this field.
The way file system works in linux and the reason its open-source, has really aroused my interest greatly in it. I am planning to start to learn kernel hacking and shell scripting. I have been doing my research and have few questions before i move on with it.
I have managed an extra laptop just for my linux learning and it has good configuration to support all the linux distros. I am planning to use Fedora distro to start with it. I just wanted to know if its a good idea to start off with fedora. I am more interested in learning linux from command line and shell, so is fedora a good choice ?
Also, how about using freeBSD in UNIX. I read somewhere that its very stable and also very good for learning command line and scripting concepts ?
I read previous posts and found that every distro has its own advantages and disadvantages particular to users, i just wanted to figure out the best options in my case, where i want to be good with command line, scripting and kernel level programming and configurations.
I would be really grateful if anyone can help me !!!
![Big Grin Smilie](https://www.unix.com/images/smilies/biggrin.gif)
Thanks
Rohit
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LEARN ABOUT CENTOS
sulogin
SULOGIN(8) System Administration SULOGIN(8)
NAME
sulogin - Single-user login
SYNOPSIS
sulogin [options] [tty]
DESCRIPTION
sulogin is invoked by init when the system goes into single user mode.
The user is prompted:
Give root password for system maintenance
(or type Control-D for normal startup):
sulogin will be connected to the current terminal, or to the optional tty device that can be specified on the command line (typically
/dev/console).
After the user exits the single-user shell or presses control-D at the prompt, the system will continue to boot.
OPTIONS
-e, --force
If the default method of obtaining the root password via getpwnam(3) from the system fails, manually examine /etc/passwd and
/etc/shadow to get the password. If they are damaged or nonexistent, sulogin will start a root shell without asking for a password.
Only use the -e option if you are sure the console is physically protected against unauthorized access.
-p, --login-shell
Specifying this option causes sulogin to start the shell process as a login shell.
-t, --timeout seconds
Specify the maximum amount of time to wait for user input. By default, sulogin will wait forever.
-h, --help
Print a help message.
-V, --version
Output version.
ENVIRONMENT VARIABLES
sulogin looks for the environment variable SUSHELL or sushell to determine what shell to start. If the environment variable is not set, it
will try to execute root's shell from /etc/passwd. If that fails it will fall back to /bin/sh.
AUTHOR
sulogin was written by Miquel van Smoorenburg for sysvinit and later ported to util-linux by Dave Reisner and Karel Zak.
AVAILABILITY
The sulogin command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils
/util-linux/>.
util-linux Jul 2012 SULOGIN(8)