02-02-2010
Quote:
Originally Posted by
aixlover
I accidentally changed root shell from /bin/bash to bash in /etc/password, then logged out from root. [,,,]
My question: Do I have to reboot the system to single user mode to fix the problem?
Thank you in advance!
Artur's suggestion, if doable, is the best option available IMHO.
Loïc.
10 More Discussions You Might Find Interesting
1. HP-UX
Good Day
Our HP box was hacked and the passwd file has been altered,there are only 2 user accounts active,and these dont have any administrative rights.I need to edit the passwd file to correct the su and root entries.
Does any body have any suggestions as to how i can do this with out the root... (10 Replies)
Discussion started by: cantona7
10 Replies
2. UNIX for Dummies Questions & Answers
Hi,
I am new to UNIX, and have recently installed Suse 9.3. I have been experimenting with all of the commands and have somehow managed to modify the default shell of the root user to an invalid file. Consequently I cannot su to the root user as I receive the 'no such file or directory' error... (2 Replies)
Discussion started by: Tony Montana
2 Replies
3. UNIX for Advanced & Expert Users
I knew it would happen sooner or later....
We have a requirement that specific individuals need "sudo root" authority. I knew it only a matter of time before someone decided to change the root password (at least they owned up to it).
Now the question is how can I grant all rights except... (4 Replies)
Discussion started by: scottsl
4 Replies
4. UNIX for Dummies Questions & Answers
I booted up Sun V240 server with boot cdrom -s using the Sun Operating System CD. I now am at the # prompt and su - root . The system will not allow me to set password for root. Get following error:
# passwd
New Password: xxxxxxxx
Re-enter new Password: xxxxxxxx
passwd: Unexpected failure. ... (4 Replies)
Discussion started by: mayewil
4 Replies
5. Solaris
Any body pls let me know the procedure to recover ROOT password in Sun Netra 20 Server..I forgot the password. (5 Replies)
Discussion started by: gini
5 Replies
6. UNIX for Dummies Questions & Answers
heyy
i forgot my root passwd but i cant reinstall due to some reason can anyone tell me hw to reterive root passwd (10 Replies)
Discussion started by: mightypp.nits
10 Replies
7. Solaris
I was installing sfw sudo and its dependencies (libiconv, libintl, libgcc)on Solaris 10, running on an x86 x4200 and I corrupted some PAM library files. It's a standard Solaris 10 base install, with some added software & libraries from a vendor.
I am on console trying to get root access back,... (1 Reply)
Discussion started by: Mariognarly
1 Replies
8. Solaris
Hi,
We were facing cron job failures and raised a case to our UNIX team, they fixed the issue and said cron job failures due to root mail file corruption.
My questions are,
1. Whether root mail file corruption cause cron job failures?
2. Do we have any size limitation for root mail file?... (0 Replies)
Discussion started by: paventhan
0 Replies
9. UNIX for Dummies Questions & Answers
I have a legacy Solaris 8 machine. Someone has overwitten the passwd utility so I now can't change passwords.
Is there somwhere I can download a copy? I do have the installation CDs as well.
Thanks (1 Reply)
Discussion started by: hawess
1 Replies
10. UNIX for Advanced & Expert Users
did a big mistake, changing root entry of /etc/passwd to
root:x:0:0:root:/root:/usr/bin/tmux split-window -v \; attach
as expected, now I can't login as root anymore. sudo ed /etc/passwd etc. doesn't work.
Any idea?
Use code tags to increase readability and follow the rules. (4 Replies)
Discussion started by: dodona
4 Replies
LEARN ABOUT LINUX
sulogin
SULOGIN(8) Linux System Administrator's Manual SULOGIN(8)
NAME
sulogin - Single-user login
SYNOPSIS
sulogin [ -e ] [ -p ] [ -t SECONDS ] [ TTY ]
DESCRIPTION
sulogin is invoked by init(8) when the system goes into single user mode. (This is done through an entry in inittab(5).) Init also tries
to execute sulogin when the boot loader (e.g., grub(8)) passes it the -b option.
The user is prompted
Give root password for system maintenance
(or type Control-D for normal startup):
If the root account is locked, as is the default on Ubuntu, no password prompt is displayed and sulogin behaves as if the correct password
were entered.
sulogin will be connected to the current terminal, or to the optional device that can be specified on the command line (typically /dev/con-
sole).
If the -t option is used then the program only waits the given number of seconds for user input.
If the -p option is used then the single-user shell is invoked with a dash as the first character in argv[0]. This causes the shell
process to behave as a login shell. The default is not to do this, so that the shell will not read /etc/profile or $HOME/.profile at
startup.
After the user exits the single-user shell, or presses control-D at the prompt, the system will (continue to) boot to the default runlevel.
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.
This is very valuable together with the -b option to init. To boot the system into single user mode, with the root file system mounted
read/write, using a special "fail safe" shell that is statically linked (this example is valid for the LILO bootprompt)
boot: linux -b rw sushell=/sbin/sash
FALLBACK METHODS
sulogin checks the root password using the standard method (getpwnam) first. Then, if the -e option was specified, sulogin examines these
files directly to find the root password:
/etc/passwd,
/etc/shadow (if present)
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.
AUTHOR
Miquel van Smoorenburg <miquels@cistron.nl>
SEE ALSO
init(8), inittab(5).
17 Jan 2006 SULOGIN(8)