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.

• 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
$

/mnt/d/COHORTE 16 HOLBERTON/simple_shell$ /bin/ls -l                           
total 56
-rwxrwxrwx 1 root root   220 Dec  8 12:42 AUTHORS
-rwxrwxrwx 1 root root  3176 Dec  8 12:53 README.md
-rwxrwxrwx 1 root root  2449 Dec  7 18:39 folder_fun.c
-rwxrwxrwx 1 root root  3112 Dec  7 18:39 folder_fun_1.c
-rwxrwxrwx 1 root root  1191 Dec  7 18:39 folder_fun_2.c
-rwxrwxrwx 1 root root  1227 Dec  7 19:15 function.c
-rwxrwxrwx 1 root root 22528 Dec  8 18:58 hsh
-rwxrwxrwx 1 root root  1012 Dec  8 11:18 main.c
-rwxrwxrwx 1 root root  1349 Dec  8 11:18 main.h
-rwxrwxrwx 1 root root   981 Dec  7 19:40 man_1_simple_shell
/mnt/d/COHORTE 16 HOLBERTON/simple_shell$ 

root@NELSON-G:/mnt/d/COHORTE 16 HOLBERTON/simple_shell# ./hsh
prompt$ ls
AUTHORS    folder_fun.c    folder_fun_2.c  hsh     main.h
README.md  folder_fun_1.c  function.c      main.c  man_1_simple_shell
prompt$ exit
root@NELSON-G:/mnt/d/COHORTE 16 HOLBERTON/simple_shell# 

• 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.
• 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/
• Write a man 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

• Reinaldo Castro - Rcastro89
• Nelson Gallego - NELSONANDREY