LINUX INTERVIEW QUESTION AND ANSWER.

1 . HOW TO TAKE BACKUP IN LINUX?

ANS :- TO TAKE A BACK UP IN LINUX , YOU CAN THE tar COMMAND . FOR EXAMPLE , TO CREATE A COMPRESSED ARCHIVE OF A DIRECTORY NAMED SOURCE , YOU CAN USE :

CODE EXAMPLE :-

tarc-czvf backup.tar.gz /path/to/source

2. WHY e2fsck IS USED ? IS IT NECESSARY TO USE THIS?

ANS :- e2fsck (ext2/3/4 file system check ) IS A UTILITY IN LINUX USED TO CHECK AND REPAIR INCONSITENCIES IN ext2, ext3, and ext4 file systems . IT IS PART OF THE e2fsprogs , WHICH PROVIDES TOOLS FOR MANAGING ext2/3/4 file system.

3. WHAT IS PID IN LINUX ?

ANS :- IN LINUX, PID ( PROCESS IDENTIFIER ) IS A UNIQUE NUMERICAL IDENTIFIER ASSIGNED TO EACH RUNNING PROCESS, ENABLING THE OPERATING SYSTEM TO MANAGE AND TRACK INDIVIDUAL PROCESSES.

4.HOW TO EXECUTE CMD IN PRIVILAGES LINUX ?

ANS :- TO EXECUTE A COMMAND WITH ELEVATED PRIVILAGES IN LINUX , YOU TYPICALLY USE THE ” sudo” COMMAND . “sudo” ALLOWS AUTHORISED USERS TO EXECUTE A COMMAND AS THE SUPERUSER OR ANOTHER USER , AS SPECIFIED BY THE SECURITY POLICY CONFIGURED IN THE   /etc/sudoers FILE.

5. HOW TO FILE RENAME AND TRANSFER ONE MACHINE TO ANOTHER?

ANS :-(A) RENAME THE FILE :

ON THE SOURCE MACHINE , USE THE “mv” COMMAND TO RENAME THE FILE :

EXAMPLE :-  mv file.txt        new_file.txt

:-(B) TRANSFER THE FILE:

USE scp TO SECURELY COPY THE RENAMED FILE TO THE DESTINATION MACHINE. REPLACE USER WITH YOUR USERNAME, source_machine WITH THE IP ADDRESS OR                          HOSTNAME OF THE SOURCE MACHINE , AND ADJUST THE PATHS ACCORDINGLY:

EXAMPLE :-  scp new_file.txt user @destination_machine:/path/to/destination/directory/

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