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Linux interview questions

1. What is init process?

Ans: Every process  will be having a parent process except init process. It is parent process in the system.it is first process initiate by kernel. PID of init will be1.

2. How to create  partion  in Linux?

Ans: Fdisk is  command to create partion.To see partion list fdisk –l.To create partion  fdisk /dev/sda or  hda.

3.what are commonly used  kill command signals?

Ans: Kill –l wll list out all signals of kill command.There are 64 signals in linux mainly we use five important signals.

  Reloading signal

  9.killing process

  15.for terminating process

  20.for stopping the process

4. Difference between ext3 and ext4 file system?

Ans: Ext3 stands for third extended file system.It was  introduced in 2001.max file size can be 16gb to2tb. supports journaling feature.Ext4 stands  for fourh extended file system.It was introduced in 2008. Maximum file size can be 16gbto 16tb.supports journaling feature.

5. How to create ftp user?

Ans: Suppose  paul  new  user want to be ftp user. Useradd paul.assign password for user.passwd paul.in configuration file  vsftpd.conf local enable=yes. 

    6. What is port number for ftp?

      Ans: Port no:20 for ftp data transfer

     Port no:21 for ftp control connection

7. Which file store  all services  and port numbers?
Ans: All services and port numbers are in /etc/services.Each service is assigned with default port no.

8. How to down load a package using yum tool with out install?
Ans: Yum install –download  package name.before that download plug should be installed .For that yum install  --download .

9. How to view jobs info with job id?
Ans: Jobs command will list out jobs in back ground.it also displays with job id.

10. How to send job to back ground?
Ans: Presently running job stopped by  pressing  ctrl+z.then  type bg which leads  frount ground job to back ground.

11. How to send four ground job to back ground?
Ans: fg command which takes back ground job to front ground.

12. What are port numbers for samba?
Ans: netbios-ns - 137/tcp

netbios-dgm - 138/tcp

netbios-ssn - 139/tcp

microsoft-ds – 445/tcp

13. What is LILO?

Ans: LILO is boot loader for older linux systems. It is  used to start operating system.GRUB is latest boot loader for latest linux systems.

14. How to create print q in linux?

Ans: Start print q from linux  system type /usr/bin/enable  printer model

Stop print queue  type /usr/bin/disable printer model

15. What is  command to know open ports on remote machine?

Ans: Type  nmap is command to know open ports on remote machines.