Smallsh

OSU Winter2023 | CS344- Operating Systems✨

Smallsh Goals and Requirements

In this assignment you will write smallsh your own shell in C. smallsh will implement a command line interface similar to well-known shells, such as bash. Your program will

• Print an interactive input prompt
• Parse command line input into semantic tokens
• Implement parameter expansion
• Shell special parameters $$, $?, and $!
• Tilde (~) expansion
• Implement two shell built-in commands: exit and cd
• Execute non-built-in commands using the the appropriate EXEC(3) function.
• Implement redirection operators ‘<’ and ‘>’
• Implement the ‘&’ operator to run commands in the background
• Implement custom behavior for SIGINT and SIGTSTP signals

How to Run and Exit

Make sure that you have an environment where you can run C program. There are two ways to run the project.

1. With the attached the makefile.

make
./smallsh
ctrl + c to exit

2. Compile files with gcc 99

gcc -std=c99 -o smallsh smallsh.c
./smallsh
ctrl + c to exit

Duration of the project

It took me about 10 days to build this project. Prior to this project, I already finished "base64 encode project" and "tree project" to warm up.

License

Created by Hiromi Watanabe. Please do not use this to cheat on your project.