Holberton Simple Shell project

Requirements

• Allowed editors: vi, vim, emacs
• All files will be compiled on Ubuntu 14.04 LTS
• 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
• 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
• Header files should be include guarded

Output

• Unless specified otherwise, your 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]

Mandatory Tasks

Task Number	Description
0	Write a README, man page, and have an authors file in your repository
1	Write a beautiful code that passes the betty checks
2	Write a UNIX command line interpreter.
3	Handle command lines with arguments
4	Handle the PATH
5	Implement the exit built-in, that exits the shell
6	Implement the env build-in, that prints the current environment
7	Write a blog post about what happens when you type ls -l in the shell

Advanced Tasks

Task Number	Description
8	Write your own getline function
9	You are not allowed to use strtok
10	Handle arguents for the built-in exit
11	Handle Ctrl+C: your shell should not quit when user inputs ^C
12	Implement the setenv and unsetenv builtin commands
13	Implement the builtin command cd
14	Handle the commands separator ;
15	Handle the && and
16	Handle aliases
17	Handle variables replacement, Handle $? variable, Handle the $$ variable
18	Handle comments (#)
19	Implement the help built-in
20	Implement the history build-in, without any argument
21	Shell can take a file as a command line argument.