Understand and use essential tools

Question 1

how to create a hard linked file

Answer 1

ln file /new/file

Question 2

how to create a soft/symbolic link

Answer 2

ln -s file /new/symlink-file

Question 3

how to compress a file/folder

Answer 3

tar -czvf name-of-archive.tar.gz /path/to/directory-or-file

Question 4

how to extract a file(s)/folder(s)

Answer 4

tar -xzvf archive.tar.gz