I forgot the root password on my linux machine

Linux basic commands FAQ

Simple tasks for simple minds

The “forgotten root password”

Q. I forgot the root password on my linux machine. How do I change the password ?

R. The easiest way to change the “forgotten root password” is to boot your Linux machine in the single-user mode, namely at the “lilo”prompt, during the bootup you will type:

linux single

This will log you in as “root” without asking for a password. As root, you may now change the root password using passwd command ( the old password is not required ):

passwd

If this seems to you insecure or to simple to be true, that is because no computer system is realy secure if other people have physical access to the computer hardware.

There is a way to secure the lilo boot, but this will be the subject for another article.

Linux change root password

Linux basic commads FAQ:

Simple task for simple minds

Q. How do I change the root password on a linux ( unix ) operating system ?

 

R. What you need to do in order to change the root account password on a linux or unix machine is:

 

- open a terminal an login as root ( if the system permits loging in as root )

or

- open a terminal, login with your account and type “su” to become root.

Enter the ( old ) root password to login

then type “passwd” and it will prompt you for a new password.

—————————-

 

root@ibm:/# passwd

 

Changing password for root
Enter the new password (minimum of 5, maximum of 127 characters)
Please use a combination of upper and lower case letters and numbers.

 

New password: **********
Re-enter new password: **********

Password changed.

 

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This should be all.

P.S. The password should be rather complex, containing numbers and letters. However try to pic one that you will remember easily, but not known by everybody.

 

Linux TAR Command

Quick Start: Here we’l present quick start examples explained.

Create linux tar gz (Gzip) archive

tar -czvf myarchive.tgz mydirectory/

We use the -t option to create an linux tar archive
-c, –create                      create a new archive

Note that .tgz is the same thing as .tar.gz

Create linux simple tar archive (withouth compresion)

tar -cvf myarchive.tar mydirectory/

Extracting linux tar archive:

Extract linux tar gz (Gzip) archive
tar -xzvf mystuff.tgz

Extract linux simple tar archive
tar -xvf mystuff.tar

We use -x to extract the files form the tar archive
-x, –extract, –get    extract files from an archive

And now let us shortly explain this command

Usage: tar [OPTION]… [FILE]…

Let us check the option used in this example

-c, –create                      create a new archive
-z, –gzip, –ungzip        filter the archive through gzip
-v, –verbose                   verbosely list files processed
-f, –file=ARCHIVE          use archive file or device ARCHIVE

Testing / viewing your archive

tar -tvf myarchive.tar
tar -tzvf myarchive.tgz

Here we used the - t opton
-t, –list                           list the contents of an archive

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Go ahead, try out these commands and stay tuned; we will come up with more doccumentation on linux tar command

Why basic Linux Commands ?

Because I for one, am not a Linux or UNIX guru, and still need to use Linux and Linux basic (or not so basic) commands.

So I decided to gather all the articles about simple Linux and UNIX commands, in one place. linuxbasiccommands.wordpress.com will be the place for there articles. Stay tuned, I will update frequently.