What is the use of umask

What is grub and lilo

How to create partitions in linux

Tell me the steps to reduce the partition size in LVM

What is difference between capital “L” and small “l” in lvextend command

What filesystem is used to access remote filesystem

How to create swap partition and how to check swap partition size?

What is target and runlevels in Linux

How to delete line in vim

How to copy files across the system?

Explain FHS (Filesystem Hierarchy Standard)

How to check free memory?

Difference between du and df command

what is inode

Inspite of free space available in partition unable to create file what could be the reason?

What is ACL, How to set ACL & How to remove ACL

What is SUID, How to set SUID & How to remove SUID

What is SGID, How to set SGID &How to remove SGID

What is Sticky Bit How to set Sticky bit & How to remove Stickybit (/tmp, /usr/bin/passwd)

What is Chattr command, how to set chattr and How to remove chattr

difference between symlink and hardlink

How to create symlink and hardlink

As a Linux admin explain you daily routines

How to check listen ports(UDP & TCP)

How to check default target(runleve)

How to check size of directory

Do you have any idea about Patching

How to check all installed packages

Have you done patching in your organization if yes, please explain

How to rollback to previous state through yum

What operating system is your organization is using

What kernel version you are working

Command to check hardware related information in Linux?

Difference between cron and anacron

Fields of /etc/fstab

Where cron logs are stored?

Difference between /etc/fstab and /etc/mtab

What is the use of UUID & How to check UUID

How to scan new lun in Linux without rebooting

How to deny cron for particular user?

Difference between find and locate command?

How to check load average and explain three values in load average?

How to check how many cpu are there in server?

If server is in HUNG state what would you do?

What is the use of SUDO

How to start service automatically when server reboot

Configuration file of sudo & what are three ALL in SUDO?

Why XFS cannot be reduced?

how to archive, compress & extract the files using tar

Explain top command output?