Minishell

Project

Minishell is one of the two project in the 42 program fourth circle. This is the first group project of the 42 common core program. In this projects the students need to create their own shell basec on sh.

Involved Language(s)

Constraints

According to the subject there only one constraint for this project:

• The whole files of the projects need to follow 42 norm [Link]

External Functions Allowed

Here are the external functions allowed for this project:

• readline
• rl_clear_history
• rl_on_new_line
• rl_replace_line
• rl_redisplay
• add_history
• printf
• malloc
• free
• write
• access
• open
• read
• close
• fork
• wait
• waitpid
• wait3
• wait4
• signal
• sigaction
• sigemptyset
• sigaddset
• kill
• exit
• getcwd
• chdir
• stat
• lstat
• fstat
• unlink
• execve
• dup
• dup2
• pipe
• opendir
• readdir
• closedir
• strerror
• perror
• isatty
• ttyname
• ttyslot
• ioctl
• getenv
• tcsetattr
• tcgetattr
• tgetent
• tgetflag
• tgetnum
• tgetstr
• tgoto
• tputs

Project breakdown

Our group splitted the workload in 2 parts:

• The input parsing handled by GreenPG.
• The remainings features (creation and/or execution of commands, signal management, etc.) was handled by myself.

Mandatory Features

In the following array a list of the features requested by the subject:

Name	Descripion	status
Prompt	Display a prompt when waiting for a new command	✅
History	Have a working input history	✅
PATH	Search and launch the right executable (based on the PATH variable or using a relative or an absolute path).	✅
'	Handle single quote	✅
"	Handle double quote	✅
|	The output of each command in the pipeline is connected to the input of the next command via a pipe.	✅
Env Variable	Handle environment variables ($ followed by a sequence of characters) which should expand to their values.	✅
$?	Have a working input history	✅
	Redirections
<	Should redirect input.	✅
<<	Should redirect output.	✅
>	Should be given a delimiter, then read the input until a line containing the delimiter is seen. However, it doesn’t have to update the history!	✅
>>	Should redirect output in append mode.	✅
	Signaux
ctrl-C	Displays a new prompt on a new line.	✅
ctrl-D	Exits the shell.	✅
ctrl-\	Does nothing.	✅
	Builtins
echo	echo with option -n	✅
cd	cd with only a relative or absolute path	✅
pwd	pwd with no options	✅
export	export with no options	✅
unset	unset with no options	✅
env	env with no options or arguments	✅
exit	exit with no options	✅

Bonus Features

In the following array a list of the bonus features requested by the subject:

Name	Descripion	status
&&	With parenthesis for priorities.	❌
||	With parenthesis for priorities	❌
Wildcards	Should work for the current working directory.	❌

Usage

make to compile.

clean to clean all compiled file without the library file.

fclean to clean all compiled file with the library file.

re to fclean then make.