I have a excesise question and i answer 3 of them but im bit confuse with the last question number 4
1 Create and go inside directory name a
2 Create files 'b' and 'c' with few paragraphs of text in both of them.
cat> a (press enter)
ctrl D (quit)
cat> b (press enter)
ctrl D (quit
3 Create directories '1' '2' '3' with single command where directory '3' is inside directory '2' and directory '2' is inside directory '1'
2 Move file 'b' to directory '2'
3 Move file 'c' to directory '3'
4 Copy files 'b' and 'c' to each directory inside directory 'a' where they already do not exist.