Linux interview Questions :

Linux Interview Questions: ========================= Linux Interview Questions: ============================= 1).what is the differnece between df and du command into linux os ? 2).where we use the df and du command into linux os ? 3)./etc/passwd and /etc/shadow . Why w can;’t merge tow files into single files into linux os ? 4).Can normal user can access the /etc/shadow file into linux os? 5).lablk and fdisk command ? Both are the same or different into linux os ? 6).hav you created any lvm into linux os ? 7).if you want o see the lvm . Which comman dare u going to be executed into linux os ? 8).Ypu know the how to extend the lvm into linux os ? 9).why we do the resize2fs into linux os ? 10).am trying to create the file /opt directory or is /var diredtcoyr We are getting the permsiioisn dried issue or disk space related issue and no space issues into linux os ? How to troubleshooting into it ? 11).what is the inode into linux os ? 12).how to see the indies into it? 13).Have you done the patching into linux os ? 14).why do we the patching into linux os ? 15).what type of differnt of vulnerabilities into linux os ? 16).service request ? Change request? Incident management what all are those things into it ? 17).what is the differnece between update and upgrade command into linux os ? 18).how you do the packing after rollbacks into linux os ? 19).u know the scp and rsync command into linux os right ? 20).both are the same or different into linux os ? 21).u know the booting sequences into linux os ? 22).what is the size of MBR into linux os ? 23).are u using the find and grep command into linux os ? 24).what is the differnece between find and grep command into linux os ? 25).please wrote the log file using the find and grep command into linux os ? 25).How to take backup in mysql db ? mysqldump -u root -p mydatabase > mydatabase_backup.sql =================== mysqldump -u root -p --all-databases > alldb_backup.sql ===================== Restre the mysql database into mysql: mysql -u root -p mydatabase < mydatabase_backup.sql ================== 26).what are the DDL commands or DDL commands into linux os ? CREATE Create database/table ALTER Modify table DROP Delete table/database TRUNCATE Remove all rows (structure stays) RENAME Rename table ————— Command Purpose INSERT Add data SELECT Read data UPDATE Modify data DELETE Remove data ================ 27).u have to search the pattern ip addrsss only for using the sql command into ? What else into it ? 28).have you configure nfs ? Nfs port number ? 29).am tyring to do a ssh to a server . Am get the error like timeout issues into it? What could be the reason into it? 30).