💻 42sh 🐚

Description 📝

The 42sh is a project carried out by groups of 5, during our 1st year in EPITECH Grand Ecole program.
Its purpose is to recreate in C a Unix shell based on TCSH.
In addition, we’ve taken inspiration from Powerlevel10k for our shell prompt.

Usage ⚔️

You can run 42sh like this :

./42sh

You can execute script with 42sh like this :

./42sh [script]

You can also add the 42sh to the shebang of a script, and when you run the script it will use the 42sh.

For more information, please see the help section.

> ./42sh --help
USAGE
     ./42sh
     ./42sh [script]
DESCRIPTION
     A Unix shell based on TCSH.
     You can execute the help command to see the list of available builtins.

Features list 📋

Our 42sh includes many of the features found in TCSH :

• Executing a simple command
• Executing recreated builtins :
  • about
  • alias
  • cd
  • echo
  • else
  • end
  • endif
  • env
  • exit
  • foreach
  • help
  • history
  • if
  • repeat
  • set
  • setenv
  • source
  • unalias
  • unset
  • unsetenv
  • where
  • which
• Dynamic prompt
• Dynamic line edition (use arrow and ctrl command)
• Use of history and event (all commands are stock in the .42sh_history)
• Use of variable (local and environmental)
• Handle of specials variabes (~, ? and some other variables)
• Handle backticks ("`")
• Handle semi-colons (";")
• Handle operators ("&&" and “||”)
• Handle pipes ("|")
• Handle redirection ("<", “<<”, “>” and “>>”)
• Handle inhibitors (’"’, “’” and “\”)
• Handle parentheses ("()")
• Handle globbing ("*", “?”, “[” and “]”)
• Handle alias
• Handle scripting and scripting commands (if, else, endif, foreach and end)

Result 🚩

The result of this project is a almost perfect shell, very similar to TCSH.
If you discover a problem or an error, don’t hesitate to create an issue and report it to us as soon as possible.

my.epitech.eu result

Category	Percentage	Numbers of tests	Crash
basic tests	100%	4/4	No
path handling	100%	5/5	No
setenv and unsetenv	100%	2/2	No
builtin cd	100%	3/3	No
line formatting (space and tabs)	100%	8/8	No
error handling	100%	6/6	No
separator	100%	1/1	No
simple pipes	100%	3/3	No
advanced pipes	100%	6/6	No
redirections	100%	5/5	No
advanced manipulations	100%	3/3	No
&& and || tests	100%	3/3	No
globbing	100%	1/1	No
var interpreter	66,7%	2/3	No
inhibitor	100%	2/2	No
magic quotes	0%	0/3	No
alias	100%	4/4	No
scripting	0%	0/1	No
foreach	0%	0/1	No
which	100%	2/2	No
where	100%	2/2	No
if	0%	0/2	No
repeat	100%	1/1	No
parenthesis	0%	0/1	No
Results	87,5%	63/72	No

Tests and code coverage

Functional tests were carried out with a bash tester and unit tests using criterion.
Unit tests are still to be performed, but a large part of the code is already covered:

• Lines: 84.8%
• Functions: 94.7%
• Branches: 45.4%

You can run the tester with this command :

./tester.sh

You can compile the project and run the tester with this command :

make tests

You can compile the project and run the unit tests with this command :

make tests_run

For more details, please click here.

Compilation 🛠️

You can compile the project with this command :

make

If you want to debug the program, you can compile the project with this :

make debug

If you want clean the project, you can run this command :

make fclean

You can clean and compile the project with make re and for debugging make re_debug

You can compile the unit tests with this command :

make unit_tests

Documentation 📚

The documentation is accessible here.

You can generate the documentation with this command :

make doc

You need multiple package for generate them :

• doxygen
• doxygen-latex
• doxygen-doxywizard
• graphviz

Code mandatory 📦

• You’ll need to create a branch where you’ll push your code. Once you’ve completed your tasks on this branch, we’ll work together to merge it and check that everything works.
• Every function you add must be code-style and documented.
• Before merging, you’ll need to check that all unit tests pass by running make tests_run.
• If the github actions don’t succeed, then ask yourself some questions
• Each commit will contain [+] or [-] or [~] followed by a message
  • [+] : Added functionality
  • [-] : Delete feature
  • [~] : Feature modification

Of course, in exceptional cases, we may depart from these rules.

Contributors 👥

For this project, we were a group of 5 people. Here are the people in the group:

• Arthur WARIN
• Christophe VANDEVOIR : also published the 42sh
• Gianni TUERO
• Nicolas TORO : also published the 42sh
• Raphael ROSSIGNOL