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rpm command is used to manage and install software packages.

This command performs installation, removal and verification of

software package.

Each package is actually an rpm packages.

rpm consists of an archive of software file and information to

install.

Each archive is resides as a single file with a name that ends with

.rpm

Using rpm command

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rpm command is used either for installing or uninstalling package.

Syntax:rpm [parameter] package name [options]

parameter:

-i - Installs package.

-U - Updates package.

-e - Remove a package.

-qi - Displays information for an installed

package.

-ql - Displays file list for installed package

-qpi - Displays information from an rpm package file.(used for uninstalled packages)

-qpl - Displays file list from an rpm package file. (used for

uninstalled packages)

Using rpm command

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Options:

--force - Forces installation despite conflicts

--nodeps - Install or remove without doing anydependency checks.

--aid - Automatic dependency to install a

package. (While available of package

rpmdb-redhat aid option will work

Using rpm command

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To view an IP-address

Two methods available in linux to view the ip address

ifconfig :

-shows the ip address of the active interfaces with hardware

address.

ip-it can show ip address of a particular interface by taking the

interface name as argument

Example:

ifconfig eth0

ip a :

- simply shows the ip address of all interface.

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ifup / ifdown command

Ifup:

-ifup command is used to activate the interfaces.

Syntax:

ifup

Ifdown:

-ifdown command is used to deactivate the interface

Syntax:

ifdown

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In linux ip address can be assigned by the following methods.

netconfig:- to assign permanent ip address to the interface

Ifconfig:

- to assign temporary ip address to the interface.

Syntax:

ifconfig subnetmask

broadcast

ip a a :- to assign additional ip address temporarily

Syntax:

ip a a dev

Assigning ip address

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ping command

It is used to detect whether a system is up and running.

Syntax:

ping [options]

orping [options]

Options:

a - audible ping

b - to ping the broadcast address

c - stop sending packets after count.

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Standard Boot loader

There are two standard boot loader are used in Linux

GRUB

GRand Unified Boot loader

LILO

LInux LOader

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GRUB

GRUB Grand Unified Boot Loader

is a multi boot loader that operates similar to LILO and default

boot loader for Redhat Linux.

Using GRUB user can select operating systems to run from a menuinterface displayed when a system boot up

Supports MD5 password protection, a boot menu editing mode

and a shell like command line interface available at boot time.

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LILO

LILO means Linux loader

LILO is a program written to boot sector of a disk that loads the

OS and starts execution.

It is an older version of boot loader of Red Hat Linux.

LILO loads the Kernel based on its actual sector location on the

disk , rather than its file name

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/etc/lilo.conf - Configuration file

lilo -v - To install or update the lilo

boot loader.

lilo -t - Test the configuration before

installation.

lilo -u- To restore the MBR backup.

Grubby - bootloader-probe : to show

the a current boot loader.

LILO

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/boot/grub/grub.conf

This is configuration file for grub boot loader.

grub-install /dev/hda

To install the grub boot loader in hda device.

grubbybootloader-probe

To show the current boot loader .

GRUB installation

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Kernel initializationAs systems boots, kernel get initialized and the following functions

are occurred.

Device detection: kernel will compile the device drivers and locate it

to the corresponding devices.

Mounts root file system: After the device detection the kernel willmount the root file system as read only.

Load initial process: The very first process (init) is then loaded

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Initial process

Init :

It is the superior of all processes.

As soon as init process is loaded the control is passed from

kernel to this process.

/etc/inittab:

File which contains the information on how init should setup

the system in every run level, as well as the run level to use a

default.

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Run levels

init 0 : Shutdown the system or halt

init 1 : Single-user mode.

init 2 : Multi-user mode with out networking support.

init 3 : Multi-user mode with networking support.

init 4 : Unused.

init 5 : Graphical user interface.

init 6 : Reboot the system.