The subject is UNIX

Please answer questions and include the Exercise number.

Exercises:

3.7, How does the command mv bar1 bar2 behave, where both bar1 and bar2 are directories, when (i) bar2 exists, (ii) bar2 doesnt exist?

3.8, Explain the difference between the commands cd ~charlie and cd ~/charlie. Is it possible for both commands to work?

3.9, charlie uses /usr/charlie as his home directory, and many of his scripts refer to the pathname /usr/charlie/html. Later, the home directory is changed to /home/charlie, thus breaking all his scripts. How could charlie have avoided this problem?

3.14 Explain what the following commands do: (i) cd, (ii) cd $HOME, (iii) cd ~.

3.18, What is the significance of these commands? (i) mv $HOME/include ., (ii) cp -r bar1 bar2, (iii) mv * ../bin

3.22, How do DOS and UNIX text files differ? Name the utilities that convert files between these two formats.

3.26 Name three advantages zip has over gzip.

Thank You!