Recreate a simple shell for Holberton. This assignment tasks us to build a shell which outputs exactly as the sh shell.

Only use the following functions and system calls:

Simple Shell was built and tested in the Ubuntu 14.04 LTS via Vagrant in VirtualBox and compiled with GCC version 4.8.4

Simple Shell files:

File Description holberton.h Header file that contains all the functions and standard C library header files needed prompt.c Contains the int main(void) function, entry point and prompt_handler _strtok.c Contains function that store commands in double pointer: find_command_length, array_from_strtok helpers.c Contains all helper functions: _strncpy,_strncpyconst, _strlen_const, _strcmp,_strlen habitat.c Contains all functions that handle environment/path: find_semis, store_env_variables, _getenv, _strncpycmd, print_env free_all.c Contains function that frees memory: free_all errors.c Contains functions that handle error messages: build_error_message, _puterror, end_of_file, fork_fail childs_play.c Contains functions that handle all child proccess functionality: command_is_null, exit_out, env_out, parent_free_buff_commands, create_path

Handle EOF

Parser interprets exit -- Currently, if the first 4 characters of the string are exit, the shell will exit.

Handle path

Build env function

exit handles arguments to exit -- What is exit status 4?

Handle ^C (CTRL + C) -- Find the signal and change its behavior.

Handle ;

Handle &&, and ||

Handle # Comments

getline

strtok

getenv

setenv

unsetenv

register builtins before executing commands

cd

alias

help

history

Deal with variables

Scripts as input

unfreed mallocs somewhere. (Check with Valgrind.)

Only delimiters handled are spaces and newlines.

Diego Tardio