Introduction In this assignment you will write smallsh your own shell in C. smallsh will implement a subset of features of well-known shells, such as bash. Your program will 1. Provide

a prompt for running commands 2. Handle blank lines and comments, which are lines beginning with the # character 3. Provide expansion for the variable $$ 4. Execute 3 commands (exit, cd, and status via code built into the shell 5. Execute other commands by creating new processes using a function from the exec) family of functions 6. Support input and output redirection 7. Support running commands in foreground and background processes 8. Implement custom handlers for 2 signals, SIGINT and SIGTSTP Learning Outcomes After successful completion of this assignment, you should be able to do the following • Describe the Unix process API (Module 4, MLO 2) • Write programs using the Unix process API (Module 4, MLO 3) • Explain the concept of signals and their uses (Module 5, MLO 2) • Write programs using the Unix API for signal handling (Module 5, MLO 3) • Explain I/O redirection and write programs that can employ I/O redirection (Module 5, MLO 4) 1:4