Problem
1. Explain the significance of these commands:
(i) cd ~henry,
(ii) cd ~/henry,
(iii) cd ~-,
(iv) cd -.
2. Why do shells use a profile as well as an rc file? What types of entries do you place in each?
6. Name two ways of making the modifications to ~/.profile available to the environment.
7. If your .profile contains a statement like PATH=$PATH:$HOME/bin, and you make repeated changes to the file, how should you activate the changes?