A C program that emulates a Unix Shell.
- Makefile
- header.h
- main.c
- processes.c
- shell.c
- README.md
- Shell Emulator Diagrams.pdf
- Enter the command
makein the Unix terminal from this repository to compile the micro shell program. - Enter the command
mshto run the micro shell - Enter the command
make cleanin the Unix terminal to remove the executable and any other generated files.- This will allow smooth recompilation with make
- After running the program, type in the name or path of the file you'd like to run.
- You may also pipe multiple files within the command line.
- Entering the command
exitwill exit the program while running msh.
We decided to split the program into 3 .c files and one header file. The 3 .c files, main.c, shell.c, and processes.c each handled a different part of the program.
- main.c simply launches the program and calls the begin_shell function in shell.c.
- shell.c handles all parts of the program associated with running the shell, managing user input, and ensuring graceful voluntary exit. It then passes on the parsed input to processes.c.
- processes.c handles launching of the executable files or chaining the multiple executables to ensure a proper pipe, alongside any ungraceful exits.
- header.h file is where we stored all of our included libraries, function prototypes, constants, and structures. An if-not-defined statement is included to ensure that nothing is added in to the compilation and pre-processing process more than once.
Debugging tool function.
Followed good practice in .c, .h, and makefile files.
cdworks on some unix systems
We learned how to, essentially, make a basic command line/shell. We were able to use system functions such as execvp, fork, and pipefd to properly launch (any number) applications and ensure a safe launch as well. Furthermore, my Amiel and I used git within this assignment.