Problem
1. What is the difference between an interactive and a noninteractive shell? Which features of the shell have significance only in an interactive shell?
2. Which environment variables are set by reading /etc/passwd?
3. Why are all environment variables represented in a fixed format regardless of the shell you use?
4. How do you change your shell to ksh
(i) temporarily,
(ii) permanently? How is the value of $SHELL affected in each case?