Linux / Unix: Please help as much as you can. Thnaks.

(1) Use find option: find all files from the current directory that have the permission 444 perm option - study

(2) What do the following commands do?

a. $ mv abc cbs . what would happen if in the above "cbs" is directory? . what would happen if in the above in "cbs" there is already a file abc? . what would happen if in the above abc is a directory?

b. $ cp CPU file /etc/passwd /tmp

. what is the result of the above command ? . what will be the result if "file" is a directory ?

(3)

What do the following commands do Explain.

$ date +%T $ ln $HOME/abc /tmp/abc $ ls -a $HOME