Linux / Unix: plaes help as much as you can. Thanks.

(1) How is "ls -ld" different from ls -l on a directory. Explain with example.

(2) From your home directory execute "ls -l" and "ls -ltr" . What differences if any do you notice in the nature of output ? Explain

(3) What is mkdir -p? Explain with an example.

(4) What do the following commands do? Explain in detail. a. cat< CR> # ie when you type carriage return after typing cat b. chmod -R 700 $HOME