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Lesson Posted on 20 Nov IT Courses/Linux/Linux Administration

UNDERSTANDING PROCESSES - RED HAT ENTERPRISE LINUX

WhizDome Academy

A seasoned trainer with 15+ years of teaching and working experience in IT, ISP and Telecom industries. Having...

What is a Process An instance of a program is called a Process. Any command that you give to your Linux machine starts a new process. It is possible that for the same program we have multiple processes. Types of Processes Foreground Processes Background Processes Processes in action Process... read more

What is a Process

An instance of a program is called a Process.

Any command that you give to your  Linux machine starts a new process.

It is possible that for the same program we have multiple processes.

Types of Processes

  • Foreground Processes

  • Background Processes

 

Processes in action

Process  running on system are actions running on system.

Jobs are specific to a user for that given shell where it is been run.

You can check the number of processes running by using command,

 ps aux

 

And also get the count of total processes by using command,

 ps aux | wc

 

 

A job run by user or root is specific to his profile and for that given shell.

It has nothing to do with system processes running.

 

Example,

You can write a job specific to shell, like,

 dd if=/dev/zero of=/dev/null

 

This job does nothing and shows nothing.

Input file - /dev/zero

Output file - /dev/null

 

Every command that we start from a shell is considered a shell job.

If we type command ls

So, this is shell job.

 They start and stop immediately since they have done their work.

 Hence it is important to know the difference between a job and process.

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Answered on 30 Oct IT Courses/Linux Kali Linux

Prafful Suthar

development & Computers are like air conditioners -- they stop working properly if you open WINDOWS. :)
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Answered on 30 Oct IT Courses/Linux Kali Linux

What is the best Linux distro for a new Linux user?

Smart Entry It Infrastrucuture Administration

The best Linux distros for new Linux user: •Ubuntu for inThe very best Linux distros are tailored to specific types of users. • Linux Mint A strong option for those new to Linux. • Arch Linux is one of the most popular choices around. •Tails is a privacy-oriented Linux distro... read more

The best Linux distros for new Linux user:

 •Ubuntu for inThe very best Linux distros are tailored to specific types of users.

• Linux Mint A strong option for those new to Linux.

• Arch Linux is one of the most popular choices around.

 •Tails is a privacy-oriented Linux distro which has the aim of concealing your location and identity as   much as possible.

 •CentOS is designed to be super-reliable, which is why it’s a great choice for a server.

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Answered on 30 Oct IT Courses/Linux Kali Linux

What is the best Linux distribution for stability and user friendliness?

Smart Entry It Infrastrucuture Administration

if you are looking at ease of use, then I would point you to Ubuntu. It is the most popular distribution and you will get find a lot of support online.
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Answered on 01 Nov IT Courses/Linux Kali Linux

What are some good Linux distributions for tablets?

Smart Entry It Infrastrucuture Administration

Fedora. Fedora is one of the most advanced Linux distributions around today. ... Ubuntu. Ubuntu has long been criticized for the Unity desktop, but if there is one thing that Unity does do very well is touchscreens. ... Debian. Debian is one of the most stable Linux operating systems available... read more
  • FedoraFedora is one of the most advanced Linux distributions around today. ...
  • UbuntuUbuntu has long been criticized for the Unity desktop, but if there is one thing that Unity does do very well is touchscreens. ...
  • DebianDebian is one of the most stable Linux operating systems available today.
 
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Answered on 01 Nov IT Courses/Linux Kali Linux

Why do people use Linux on their PCs?

Smart Entry It Infrastrucuture Administration

5 reasons Linux is now a great option for everyone 1. What You Need Is in an App Store 2.The Basics Are Covered 3. Updates Are Free and Easy 4. The Interfaces Are Simple 5. Linux Now Comes Pre-Installed
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Answered on 30 Oct IT Courses/Linux Kali Linux

How do I fix a problem system running on low-graphics mode in Linux?

Smart Entry It Infrastrucuture Administration

Here are the few tips for you to fix your low graphic system! Step 1 : press “ Ctrl- Alt- F1” then the terminal will be opened to do re-installation part. Step 2 : Run this command “ sudo apt-get update” which means you are updating the settings. Step 3 : After running it... read more

 Here are the few tips for you to fix your low graphic system!

Step 1 : press “ Ctrl- Alt- F1” then the terminal will be opened to do re-installation part.

Step 2 : Run this command “ sudo apt-get update” which means you are updating the settings.

Step 3 : After running it execute the below command 

             sudo apt-get -d install --reinstall gdm

Step 4 : Run this command in the termal following the above step

             sudo apt-get remove --purge gdm

             sudo apt-get install gdm

(Here gdm means graphic manager. it removes the old gdm and re-install the gdm again )

Step 5 : Before restarting the sytem execute this command.

             sudo reboot

Then you can use your pc without any problem.

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Answered on 30 Oct IT Courses/Linux Kali Linux

What does ./mean in Linux?

Smart Entry It Infrastrucuture Administration

./ means ROOT the formost primary directory from ./ you can navigate to any folder by giving the command cd eg: cd./testfile
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Answered on 31 Oct IT Courses/Linux Kali Linux

How do I write a C program to emulate the Unix LS-L command?

Smart Entry It Infrastrucuture Administration

#include <stdio.h> #include <unistd.h> #include <sys/types.h> #include <sys/wait.h> #include <stdlib.h> int main() { int pid; //process id pid = fork(); //create another process if ( pid < 0 ) { //fail printf(“ Fork... read more
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stdlib.h>
int main()
{
int pid;            //process id
pid = fork();     //create another process
if ( pid < 0 )
{                                 //fail
printf(“
Fork failed
”);
exit (-1);
}
else if ( pid == 0 )
{                     //child
execlp ( “/bin/ls”, “ls”, “-l”, NULL );  //execute ls
}
else
{                             //parent
wait (NULL);              //wait for child
printf(“
child complete
”);
exit (0);
}
}
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Answered on 30 Oct IT Courses/Linux Kali Linux

What is the smallest SBC that can run Linux?

Smart Entry It Infrastrucuture Administration

ARM cortex and ARM9 are said to be the smallest linux ready SBC, it has a MicroSD slot and WiFi.
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