diff --git a/src/common.h b/src/common.h
new file mode 100644
index 0000000..f266755
--- /dev/null
+++ b/src/common.h
@@ -0,0 +1,14 @@
+/*
+** EPITECH PROJECT, 2025
+** __
+** File description:
+** _
+*/
+
+#ifndef COMMON_H
+    #define COMMON_H
+enum {
+    RETURN_SUCCESS = 0,
+    RETURN_FAILURE = 84
+};
+#endif /* COMMON_H */
diff --git a/src/debug.h b/src/debug.h
new file mode 100644
index 0000000..0e22e16
--- /dev/null
+++ b/src/debug.h
@@ -0,0 +1,36 @@
+/*
+** EPITECH PROJECT, 2025
+** __
+** File description:
+** _
+*/
+
+#ifndef DEBUG_H
+    #define DEBUG_H
+    #include "vt100_esc_codes.h"
+    #include <stdio.h>
+
+    #define OMIT
+
+    #ifdef U_DEBUG_MODE
+        #define HEAD __FILE_NAME__, __LINE__
+
+        #define HEAD_FMT_FILE BOLD BLUE "%s" RESET
+        #define HEAD_FMT_LINE ":" BOLD PURPLE "%d" RESET
+
+        #define HEAD_FMT HEAD_FMT_FILE HEAD_FMT_LINE "  "
+
+        #define ERR(fmt, ...) fprintf(stderr, fmt, __VA_ARGS__)
+        #define DEBUG_INTERNAL(fmt, ...) ERR(HEAD_FMT fmt, HEAD, __VA_ARGS__)
+
+        #define U_DEBUG(fmt, ...) DEBUG_INTERNAL(fmt, __VA_ARGS__)
+        #define U_DEBUG_MSG(msg) DEBUG_INTERNAL("%s\n", msg)
+
+        #define U_DEBUG_CALL(func, ...) func(__VA_ARGS__)
+    #else
+        #define U_DEBUG_CALL(func, ...) OMIT
+        #define U_DEBUG_MSG(msg) OMIT
+        #define U_DEBUG(fmt, ...) OMIT
+    #endif
+
+#endif /* DEBUG_H */
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..96b84b1
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,16 @@
+/*
+** EPITECH PROJECT, 2025
+** __
+** File description:
+** _
+*/
+
+#include "debug.h"
+#include "shell.h"
+
+int main(int ac __attribute__((unused)), char **av __attribute__((unused)),
+    char **env)
+{
+    U_DEBUG_MSG("Debug mode activated.");
+    shell(env);
+}
diff --git a/src/shell.c b/src/shell.c
new file mode 100644
index 0000000..8f406bc
--- /dev/null
+++ b/src/shell.c
@@ -0,0 +1,54 @@
+/*
+** EPITECH PROJECT, 2025
+** __
+** File description:
+** _
+*/
+
+#include <signal.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include "common.h"
+#include "debug.h"
+#include "env.h"
+#include "shell.h"
+#include "u_str.h"
+
+static
+int shell_loop(void)
+{
+    int is_a_tty = isatty(STDIN_FILENO);
+    char *buffer = NULL;
+    size_t buffer_sz;
+
+    signal(SIGINT, SIG_IGN);
+    while (true) {
+        if (is_a_tty)
+            WRITE_CONST(STDOUT_FILENO, SHELL_PROMPT);
+        if (getline(&buffer, &buffer_sz, stdin) == -1)
+            break;
+        U_DEBUG("Buffer [%.*s]\n", u_strlen(buffer) - 1, buffer);
+        if (!u_str_is_alnum(buffer))
+            continue;
+    }
+    free(buffer);
+    return RETURN_SUCCESS;
+}
+
+int shell(char **env)
+{
+    buff_t env_values = { 0 };
+    env_entry_t *env_entries = NULL;
+    size_t env_size = count_env_entries(env);
+
+    env_values.str = malloc(ENV_BUFF_CAP);
+    if (env_values.str == NULL)
+        return RETURN_FAILURE;
+    env_entries = malloc(sizeof *env_entries * env_size);
+    parse_env(env, &env_values, env_entries);
+    U_DEBUG_CALL(debug_env_entries, env_entries, env_size);
+    return shell_loop();
+}
diff --git a/src/shell.h b/src/shell.h
new file mode 100644
index 0000000..1001830
--- /dev/null
+++ b/src/shell.h
@@ -0,0 +1,13 @@
+/*
+** EPITECH PROJECT, 2025
+** __
+** File description:
+** _
+*/
+
+#ifndef SHELL_H
+    #define SHELL_H
+    #include "vt100_esc_codes.h"
+    #define SHELL_PROMPT RED "|> " RESET
+int shell(char **env);
+#endif /* SHELL_H */
diff --git a/src/vt100_esc_codes.h b/src/vt100_esc_codes.h
new file mode 100644
index 0000000..a2860b7
--- /dev/null
+++ b/src/vt100_esc_codes.h
@@ -0,0 +1,27 @@
+/*
+** EPITECH PROJECT, 2025
+** __
+** File description:
+** _
+*/
+
+#ifndef CR_VT100_ESC_CODES_H
+    #define CR_VT100_ESC_CODES_H
+
+    #define ESC "\033"
+    #define CFMT(n) ESC "[" #n "m"
+
+    // move
+    #define MOVE_RIGHT(n) ESC "[" #n "C"
+
+    // colors
+    #define RESET CFMT(0)
+    #define BOLD CFMT(1)
+
+    #define RED CFMT(31)
+    #define GREEN CFMT(32)
+    #define YELLOW CFMT(33)
+    #define BLUE CFMT(34)
+    #define PURPLE CFMT(35)
+    #define CYAN CFMT(36)
+#endif