0X16.C - Simple_shell

S/o Julien Barbier

Simple shell :

Holberton School

Description :

simple_shell is a command line interpreter, or shell, in the tradition of the first Unix shell written by Ken Thompson in 1971. This shell is intentionally minimalistic, yet includes the basic functionality of a traditional Unix-like command line user interface.

Files :

[Function] :
- main - main function with shell body
- exevc - recreate execve funtcion
- exit - exit the simple shell
- memcpy - recreate memcpy funtcion
- prompt - recreate prompt funtcion
- realloc - recreate realloc funtcion
- echo_command - implementation of echo command in shell
- node_function - Add a node a the end of the linked list
- _atoi - Convert the first number of a str to an interger.
- execut_command - Test and execute a command
- sep_to_space - Change \t and \r into a space
- signal_handler - Catch a Ctrl - C and disable him
- _getline - Check the number of characters on a specific line
[PATH function] :
- init_path - Initialise a linked list of the PATH contain
- search_command_path - Search if a command is in the PATH
[str function] :
- strcmp - function compares the two strings
- strdup - function returns a pointer to a new string which is a duplicate of the string
- strlen - function calculates the length of the string pointed to by s
- strtok - breaks a string into a sequence of zero or more nonempty tokens
[check] :
- check_built_in - check all built-in command before the first fork
- check_user_input - Put a '\0' at the end of the input and check if there is any comment
[environement function] :
- setenv - set new environement
- setenv_necceseray - extension of setenv function
- _unsetenv - unset environement, set with setenv
- get_env - get actual environement
- print_env - print environement
- copy_env - copy environement
[free memory file] :
- free_all - free all malloc / realloc / buffer
[Header file] :
- shell.h - Header file contain all prototype / standart library / and structure
[Helping files] :
- README.md
- man
- AUTHORS
- _help
- _help_function

Requirements :

Usage :

Features :

Builtins :

Example of Use :

Run the executable in your terminal after compiling:

gcc -Wall -Werror -Wextra -pedantic -std=gnu89 shell.h *.c -o hsh

./hsh

exemple:

./hsh
$  # type you command here
$ ls
    bermuda_triangle.c I_hate_simple_shell.c README.md
$ echo $$
    24413
$ env
    SHELL=/bin/bash
    COLORTERM=truecolor
    TERM_PROGRAM_VERSION=1.62.3
    LC_ADDRESS=C.UTF-8
    LC_NAME=C.UTF-8
    LC_MONETARY=C.UTF-8
    PWD=/home/vagrant/Simple_shell
    LOGNAME=vagrant
    XDG_SESSION_TYPE=tty
    VSCODE_GIT_ASKPASS_NODE=/home/vagrant/.vscode-server/bin/ccbaa2d27e38e5afa3e5c21c1c7bef4657064247/node
    MOTD_SHOWN=pam
    ...
$ exit # leave de shell ctrl C hase disable

Camaltra/simple_shell