The following method can be used when a user login to a linux machine, an email will be sent with IP information.

For this to work, you need to have the program mutt installed.

Then add the following to the user’s .bashrc file, which is located in /home/$user/.bashrc

echo `who` | /usr/bin/mutt -s "SSH Alert" email@address.here

For example, if you want an email sent everytime the user root login, edit the file /home/root/.bashrc and add the above code.

Doing visudo you get nano instead of your favorite text editor?
Mine is vim therefore I issue:

DEBIAN/UBUNTU way

# update-alternatives --config editor
There are 4 alternatives which provide `editor'.
  Selection    Alternative
-----------------------------------------------
          1    /usr/bin/vim.tiny
          2    /bin/ed
*+        3    /bin/nano
          4    /usr/bin/vim.basic
Press enter to keep the default[*], or type selection number:

Selecting 4 I’m ready to use my full syntax colors when I edit any file.

OTHER DISTROS
Edit your .bashrc file and add the following:

EDITOR=vim
export EDITOR

Next login you will have your VIM working.
If you want to have it immediately and only for this session just type

# export EDITOR=vim

and press enter.

I’ve come across multiple ways of doing it but so far the best way is the following (I assume you are on i386 platform and you have access to the net):
1. Download boot.img.gz from Debian website
2. Download the net-install image choosing i386.
3. Plug your USB drive into a Linux PC, open the shell and type

$ dmesg

Last few lines should be like the following:

 sd 7:0:0:0: [sdb] Attached SCSI removable disk
 sd 8:0:0:0: [sdb] 4030464 512-byte logical blocks: (2.06 GB/1.92 GiB)
 sd 8:0:0:0: [sdb] Write Protect is off

Now we know it has been mapped as sdb

4. Use zcat to load the boot.img.gz onto your USB drive

# zcat boot.img.gz > /dev/sdb

CAUTION!!! this will destroy the entire data on the USB drive, make sure you have done the backup.
If you get an error ensure the following:
- You are root (don’t use sudo)
- The USB drive it’s not mounted, if it is umount it before issuing the above command.

5. Now mount the USB drive and copy the net-inst.iso image on it.

All done! Now plug it into the box you want to setup and enjoy the old fashion Debian installer

Setting multiple IPs on Linux or in this case Debian is rather straight forward… All the network info is stored in the file /etc/network/interfaces and you just need to add the info to the file…

Before making changes to this file, I recommend you check your values at least 3 times! If you have made a mistake and trying to do it from a remote location, YOU WILL LOCK YOURSELF OUT!

This is a sample configuration with device eth0 having the IP address of 192.168.1.2 on a Class C Network with 192.168.1.1 as the default gateway.

/etc/network/interfaces:

# /etc/network/interfaces – configuration file for ifup(8), ifdown(8)

# the loopback interface
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static

address 192.168.1.2
netmask 255.255.255.0
broadcast 192.168.1.255
gateway 192.168.1.1

In order to add multiple IPs to the same interface, In this case eth0 You need to add it in the following method…

auto eth0:0
iface eth0:0 inet static

address 192.168.1.3
netmask 255.255.255.0
broadcast 192.168.1.255

auto eth0:1
iface eth0:1 inet static

address 192.168.1.4
netmask 255.255.255.0
broadcast 192.168.1.255

auto eth0:2
iface eth0:2 inet static

address 192.168.1.5
netmask 255.255.255.0
broadcast 192.168.1.255

Thats it, after you have made all the necessary changes, you need to restart the networking by issueing the following command…

# /etc/init.d/networking restart

It is pretty easy when it comes to gaining root password to any Linux System as long as you have physical access.

This is how to change Fedora’s ROOT Password.

When your box starts up, You will see the GRUB screen…

What you need to do is, press the a Key instead of Enter

You will see something like the following…

kernel /vmlinuz-2.6.9-1.667 ro root=LABEL=/ acpi=on rhgb quiet

Add 1 at the end of that… So it looks like the following…

kernel /vmlinuz-2.6.9-1.667 ro root=LABEL=/ acpi=on rhgb quiet 1

This will make the box boot into Runlevel 1

You simply type

passwd

Enter the new ROOT password and reboot the machine.

Same thing goes for Any Linux System as welll… All you got to do is, add the following kernel argument…

init=/bin/bash

And then just change the password…