Difference between symlink and hardlink?

Command to create symlink and hardlink?

How to compress the data with tar?

Difference tools to compress data ?

What is the use of sudo?

How to give admin access to normal user?

What are the three ALL’s in sudoers file

How to give admin access to group?

what is visudo?

What is relative path and absolute path?

How to extract data to different directory from archive file?

Difference between sudo and su

How to archive the data?

What is the configuration file of sudo?