In this project we are tasked with creating our own simple UNIX command interpreter. The program must have the exact same output as sh (/bin/sh) as well as the exact same error output. The only difference is when you print an error, the name of the program must be equivalent to your argv[0].
-
Compiling the program:
gcc -Wall -Werror -Wextra -pedantic *.c -o hsh
-
Interactive mode:
$ ./hsh
($) /bin/ls
hsh main.c shell.c
($)
($) exit
$
- Non-interactie mode:
$ echo "/bin/ls" | ./hsh
hsh main.c shell.c test_ls_2
$
$ cat test_ls_2
/bin/ls
/bin/ls
$
$ cat test_ls_2 | ./hsh
hsh main.c shell.c test_ls_2
hsh main.c shell.c test_ls_2
$
- All your files will be compiled on Ubuntu 14.04 LTS
- Your C programs and functions will be compiled with gcc 4.8.4 using the flags
-Wall -Werror -Wextra and -pedantic
- All your files should end with a new line
- A README.md file, at the root of the folder of the project is mandatory
- Your code should use the Betty style. It will be checked using betty-style.pl and betty-doc.pl
- No more than 5 functions per file
- All your header files should be include guarded
- Use system calls only when you need to
- Write a (README)[./README.md]
- Write a (man)[./man_1_simple_shell] for your shell.
- You should have an (AUTHORS)[./AUTHORS] file at the root of your repository, listing all individuals having contributed content to the repository.
- Write a beautiful code that passes the Betty checks
- Write a UNIX command line interpreter.
- Your Shell should:
- Display a prompt and wait for the user to type a command. A command line always ends with a new line.
- The prompt is displayed again each time a command has been executed.
- The command lines are simple, no semicolons, no pipes, no redirections or any other advanced features.
- The command lines are made only of one word. No arguments will be passed to programs.
- If an executable cannot be found, print an error message and display the prompt again.
- Handle errors.
- You have to handle the "end of file" condition (Ctrl+D)
- Handle command lines with arguments
- Handle the PATH
- Implement the exit built-in, that exits the shell
- Usage: exit
- You dont have to handle any argument to the built-in exit
- Implement the env built-in, that prints the current environment
- Monicah Odipo - MonahDipsy
- John Mathai - johngithinji-cs