Answer / suman kumar reddy

we have 2 modes in cpu .
kernel mode and usermode.
kernel provides service to the user on request.
user executes the commands when kernel provides service to
it.after execution completes kernel looks after the system
drivers (network drivers)
user has no privelages until kernel provides service to
the user.

Answer / suchitra

actually the layers are
outermost layer is user
inner layer is kernel
and inner most layer is hardware.

so when user sends any command it willnot go directly to
hardware.first it will go and ask permission from kernel
and if kernel permits then the command will reach hardware.

so unlike in other operating system the user cannot
directly interact with hardware

Answer / ramakrishna

kernel is the core of the operating system.It is interface
between user system hardware.

Answer / nadeem

Kernel of UNIX OS can be defined as a subsystem which is
responsible for almost all tasks of an OS. Mainly some of
the responsibilies of Kernel are Process dispatching,
Process management, Memory management and so on.

Answer / suriya

Kernel is a heart of unix operating system,
it act as a interface between the computer hardware
and user. In unix all the commands are accepted by
sting operation. command interpretor(shell interpretor)
want to execute the command in computer hardware. here the
kernel takes the commands by command interpretor(shell
interpretor) and executes in computer hardware(where the
unix is loaded)Finally it produce the result.

Answer / gulshan

kernel is responsible to handle all query regarding the commands,process,every thing in os..whather it is driver or pacthes or ..hardware ..detection ...file system ...every task.......

Answer / prabakaran

Kernel : The core or key components of the OS, consists of
many kernel subsystems like process management(mgt), memory
mgt, file mgt, device mgt, and network mgt.

Each subsystem has
1. Concurrency,
2. Virtual memory,
3. Paging and
4. Virtual file system.

Answer / t.sai sree,guntur.

os is the Interphase between user and the hardware.
kernel:It is the Heart or core of the unix os.It is very
crucial and important for unix os.

Answer / nikhitha.k.pillai

functionality of kernel includes 4 features.
1.Process management
2.Memory management
3.I/O Management
4.Support functions

Answer / u.meghana

kernel forms the core of unix O.S . This interacts with the hardware.It is loaded into memory when a system is booted. It's functions are
1.Managing the system resources.
2.Allocating time for diff users and processes.
3.Deciidng process priorities and performing them

which script will invoke first ,when /etc/init.d starts

1 Answers  

How do you find files in Unix?

2 Answers  

What is the difference between Shell Programming and Shell scripting?

10 Answers   HCL, TCS, Wipro,

distinguish between multi-tasking,multi-user,multi- processing and time sharing?

7 Answers   Alcatel, Cisco, Infosys, University Exams,

Which is the command used to find out currently executing Process in UNIX?

6 Answers   Amazon,

what does the 'tee' command do?

4 Answers  

What is grep and sed command?

1 Answers  

What is the functions of zambie process?

3 Answers  

The command grep first second third /usr/you/myfile a) prints lines containing the words first, second or third from the file /usr/you/myfile b) searches for lines containing the pattern first in the files second, third, and /usr/you/myfile and prints them c) searches the files /usr/you/myfiel and third for lines containing the words first or second and prints them d) replaces the word first with the word second in the files third and /usr/you/myfile e) None of the above

4 Answers   IBM,

What do chgrp command do?

0 Answers  

What is the functionality of a top command?

0 Answers   Amazon,

Which command will you use to change the permissions on file?

7 Answers