diff --git a/src/command/builtin.rs b/src/command/builtin.rs
new file mode 100644
index 0000000..63a96b1
--- /dev/null
+++ b/src/command/builtin.rs
@@ -0,0 +1,112 @@
+use super::Command;
+use crate::error;
+use crate::error::CdError;
+use crate::error::IllegalNumberError;
+use crate::exit_code::ExitCode;
+use crate::variables::Variables;
+
+use std::{env::set_current_dir, path::PathBuf};
+
+type BuiltinFunction = fn(&Vec<String>, &mut Variables, &mut ExitCode);
+
+fn cd(args: &Vec<String>, variables: &mut Variables, exit_code: &mut ExitCode) {
+    let path: Option<PathBuf>;
+
+    if !args.is_empty() {
+        path = Some(PathBuf::from(&args[0]));
+    } else {
+        path = match variables.get("HOME").as_str() {
+            "" => None,
+            path => Some(PathBuf::from(path)),
+        };
+    }
+
+    exit_code.set_success();
+    if path.is_some() {
+        let path = path.unwrap();
+        let result = set_current_dir(&path);
+
+        if result.is_err() {
+            let error = CdError::new(&args[0]);
+            error::print(Box::new(error));
+            exit_code.set(2);
+        }
+    }
+}
+
+fn colon(_args: &Vec<String>, _variables: &mut Variables, exit_code: &mut ExitCode) {
+    exit_code.set_success();
+}
+
+fn exit(args: &Vec<String>, _variables: &mut Variables, exit_code: &mut ExitCode) {
+    if !args.is_empty() {
+        let raw_exit_code = match args[0].parse::<usize>() {
+            Ok(parsed) => Ok(u8::try_from(parsed % 256).unwrap()),
+            Err(_e) => Err(IllegalNumberError::new("exit", args[0].as_str())),
+        };
+
+        if raw_exit_code.is_ok() {
+            exit_code.set(raw_exit_code.unwrap());
+        } else {
+            error::print(Box::new(raw_exit_code.unwrap_err()));
+            exit_code.set(2);
+            ()
+        }
+    }
+
+    crate::control::exit(exit_code);
+}
+
+fn unset(args: &Vec<String>, variables: &mut Variables, exit_code: &mut ExitCode) {
+    for variable_name in args.iter() {
+        variables.unset(variable_name);
+    }
+
+    exit_code.set_success();
+}
+
+fn export(args: &Vec<String>, variables: &mut Variables, exit_code: &mut ExitCode) {
+    for variable in args.iter() {
+        let assignation: Vec<&str> = variable.split('=').collect();
+
+        if assignation.len() == 2 {
+            variables.set(&assignation[0], &assignation[1]);
+        }
+
+        variables.export(&assignation[0]);
+    }
+
+    exit_code.set_success();
+}
+
+pub struct Builtin {
+    function: BuiltinFunction,
+    args: Vec<String>,
+}
+
+impl Builtin {
+    pub fn new(argv: &Vec<String>) -> Result<Self, ()> {
+        let mut args = argv.clone();
+        let program = args.remove(0);
+
+        let function: Option<BuiltinFunction> = match program.as_str() {
+            "cd" => Some(cd),
+            "exit" => Some(exit),
+            "unset" => Some(unset),
+            "export" => Some(export),
+            ":" => Some(colon),
+            _ => None,
+        };
+
+        match function {
+            Some(function) => Ok(Self { function, args }),
+            None => Err(()),
+        }
+    }
+}
+
+impl Command for Builtin {
+    fn spawn(&mut self, variables: &mut Variables, exit_code: &mut ExitCode) {
+        (self.function)(&self.args, variables, exit_code)
+    }
+}
diff --git a/src/command/builtins.rs b/src/command/builtins.rs
deleted file mode 100644
index 6de1cde..0000000
--- a/src/command/builtins.rs
+++ /dev/null
@@ -1,79 +0,0 @@
-use crate::error;
-use crate::error::CdError;
-use crate::error::IllegalNumberError;
-use crate::exit_code::ExitCode;
-use crate::variables::Variables;
-
-use std::env;
-use std::{env::set_current_dir, path::PathBuf};
-
-pub(super) fn cd(args: &Vec<String>, _variables: &mut Variables, exit_code: &mut ExitCode) {
-    let path: Option<PathBuf>;
-
-    if !args.is_empty() {
-        path = Some(PathBuf::from(&args[0]));
-    } else {
-        path = match env::var("HOME") {
-            Ok(var) => Some(PathBuf::from(var)),
-            Err(_e) => None,
-        };
-    }
-
-    exit_code.set_success();
-    if path.is_some() {
-        let path = path.unwrap();
-        let result = set_current_dir(&path);
-
-        if result.is_err() {
-            let error = CdError::new(&args[0]);
-            error::print(Box::new(error));
-            exit_code.set(2);
-        }
-    }
-}
-
-pub(super) fn colon(_args: &Vec<String>, _variables: &mut Variables, exit_code: &mut ExitCode) {
-    exit_code.set_success();
-}
-
-pub(crate) fn exit(args: &Vec<String>, _variables: &mut Variables, exit_code: &mut ExitCode) {
-    let raw_exit_code: Result<i32, IllegalNumberError>;
-
-    if args.is_empty() {
-        raw_exit_code = Ok(i32::from(exit_code.get()));
-    } else {
-        raw_exit_code = match args[0].parse::<usize>() {
-            Ok(parsed) => Ok(i32::try_from(parsed % 256).unwrap()),
-            Err(_e) => Err(IllegalNumberError::new("exit", args[0].as_str())),
-        };
-    }
-
-    if raw_exit_code.is_ok() {
-        println!("exit");
-        std::process::exit(raw_exit_code.unwrap());
-    } else {
-        error::print(Box::new(raw_exit_code.unwrap_err()));
-    }
-}
-
-pub(super) fn unset(args: &Vec<String>, variables: &mut Variables, exit_code: &mut ExitCode) {
-    for variable_name in args.iter() {
-        variables.unset(variable_name);
-    }
-
-    exit_code.set_success();
-}
-
-pub(super) fn export(args: &Vec<String>, variables: &mut Variables, exit_code: &mut ExitCode) {
-    for variable in args.iter() {
-        let assignation: Vec<&str> = variable.split('=').collect();
-
-        if assignation.len() == 2 {
-            variables.set(&assignation[0], &assignation[1]);
-        }
-
-        variables.export(&assignation[0]);
-    }
-
-    exit_code.set_success();
-}
diff --git a/src/command/command_builder.rs b/src/command/command_builder.rs
deleted file mode 100644
index 9c523a7..0000000
--- a/src/command/command_builder.rs
+++ /dev/null
@@ -1,26 +0,0 @@
-use super::Builtin;
-use super::Command;
-use super::UnixProgram;
-
-pub struct CommandBuilder {
-    argv: Vec<String>,
-}
-
-impl CommandBuilder {
-    pub fn new(argv: Vec<String>) -> Self {
-        Self { argv }
-    }
-
-    pub fn build(&self) -> Box<dyn Command> {
-        let builtin = Builtin::new(&self.argv);
-        let command: Box<dyn Command>;
-
-        if builtin.is_err() {
-            command = Box::from(UnixProgram::new(&self.argv));
-        } else {
-            command = Box::from(builtin.unwrap());
-        }
-
-        command
-    }
-}
diff --git a/src/command/mod.rs b/src/command/mod.rs
index 3a955a6..b35d681 100644
--- a/src/command/mod.rs
+++ b/src/command/mod.rs
@@ -1,85 +1,35 @@
-pub mod builtins;
-pub mod command_builder;
+pub mod builtin;
 pub mod command_sequence;
+pub mod unix_program;
 
-use crate::error;
-use crate::error::CommandNotFoundError;
 use crate::exit_code::ExitCode;
 use crate::variables::Variables;
-
-type BuiltinFunction = fn(&Vec<String>, &mut Variables, &mut ExitCode);
+use builtin::Builtin;
+use unix_program::UnixProgram;
 
 pub trait Command {
     fn spawn(&mut self, variables: &mut Variables, exit_code: &mut ExitCode);
 }
 
-pub struct Builtin {
-    function: BuiltinFunction,
-    args: Vec<String>,
+pub struct CommandBuilder {
+    argv: Vec<String>,
 }
 
-impl Builtin {
-    pub fn new(argv: &Vec<String>) -> Result<Self, ()> {
-        let mut args = argv.clone();
-        let program = args.remove(0);
-
-        let function: Option<BuiltinFunction> = match program.as_str() {
-            "cd" => Some(builtins::cd),
-            "exit" => Some(builtins::exit),
-            "unset" => Some(builtins::unset),
-            "export" => Some(builtins::export),
-            ":" => Some(builtins::colon),
-            _ => None,
-        };
-
-        match function {
-            Some(function) => Ok(Self { function, args }),
-            None => Err(()),
-        }
+impl CommandBuilder {
+    pub fn new(argv: Vec<String>) -> Self {
+        Self { argv }
     }
-}
 
-impl Command for Builtin {
-    fn spawn(&mut self, variables: &mut Variables, exit_code: &mut ExitCode) {
-        (self.function)(&self.args, variables, exit_code)
-    }
-}
+    pub fn build(&self) -> Box<dyn Command> {
+        let builtin = Builtin::new(&self.argv);
+        let command: Box<dyn Command>;
 
-pub struct UnixProgram {
-    command: std::process::Command,
-}
-
-impl UnixProgram {
-    pub fn new(argv: &Vec<String>) -> Self {
-        let mut argv = argv.clone();
-        let program = argv.remove(0);
-        let mut command = std::process::Command::new(&program);
-        command.args(argv);
-
-        Self { command }
-    }
-}
-
-impl Command for UnixProgram {
-    fn spawn(&mut self, _variables: &mut Variables, exit_code: &mut ExitCode) {
-        let handle = self.command.spawn();
-
-        if handle.is_ok() {
-            let raw_exit_code = handle
-                .unwrap()
-                .wait()
-                .expect("error waiting for the child")
-                .code()
-                .unwrap_or(1);
-
-            exit_code.set(match u8::try_from(raw_exit_code) {
-                Ok(code) => code,
-                Err(_e) => u8::MAX,
-            });
+        if builtin.is_err() {
+            command = Box::from(UnixProgram::new(&self.argv));
         } else {
-            let error = CommandNotFoundError::new(self.command.get_program().to_str().unwrap());
-            error::print(Box::new(error));
-            exit_code.set_command_not_found();
+            command = Box::from(builtin.unwrap());
         }
+
+        command
     }
 }
diff --git a/src/command/unix_program.rs b/src/command/unix_program.rs
new file mode 100644
index 0000000..0122a86
--- /dev/null
+++ b/src/command/unix_program.rs
@@ -0,0 +1,44 @@
+use super::Command;
+use crate::error;
+use crate::error::CommandNotFoundError;
+use crate::exit_code::ExitCode;
+use crate::variables::Variables;
+
+pub struct UnixProgram {
+    command: std::process::Command,
+}
+
+impl UnixProgram {
+    pub fn new(argv: &Vec<String>) -> Self {
+        let mut argv = argv.clone();
+        let program = argv.remove(0);
+        let mut command = std::process::Command::new(&program);
+        command.args(argv);
+
+        Self { command }
+    }
+}
+
+impl Command for UnixProgram {
+    fn spawn(&mut self, _variables: &mut Variables, exit_code: &mut ExitCode) {
+        let handle = self.command.spawn();
+
+        if handle.is_ok() {
+            let raw_exit_code = handle
+                .unwrap()
+                .wait()
+                .expect("error waiting for the child")
+                .code()
+                .unwrap_or(1);
+
+            exit_code.set(match u8::try_from(raw_exit_code) {
+                Ok(code) => code,
+                Err(_e) => u8::MAX,
+            });
+        } else {
+            let error = CommandNotFoundError::new(self.command.get_program().to_str().unwrap());
+            error::print(Box::new(error));
+            exit_code.set_command_not_found();
+        }
+    }
+}
diff --git a/src/control.rs b/src/control.rs
index 42a2be3..4886006 100644
--- a/src/control.rs
+++ b/src/control.rs
@@ -1,10 +1,14 @@
-use crate::command::builtins;
 use crate::command::Command;
 use crate::exit_code::ExitCode;
 use crate::interface::get_user_input;
 use crate::parser::parse;
 use crate::variables::Variables;
 
+pub fn exit(exit_code: &mut ExitCode) {
+    println!("exit");
+    std::process::exit(i32::from(exit_code.get()));
+}
+
 pub fn run() {
     let mut current_exit_code = ExitCode::new();
     let mut variables = Variables::new();
@@ -20,7 +24,7 @@ pub fn run() {
             }
         } else {
             println!();
-            builtins::exit(&vec![], &mut variables, &mut current_exit_code);
+            exit(&mut current_exit_code);
         }
     }
 }
diff --git a/src/parser.rs b/src/parser.rs
index 171525c..21b957c 100644
--- a/src/parser.rs
+++ b/src/parser.rs
@@ -1,5 +1,5 @@
-use crate::command::command_builder::CommandBuilder;
 use crate::command::command_sequence::CommandSequence;
+use crate::command::CommandBuilder;
 use crate::interface::get_user_input;
 use crate::variables::Variables;
 use std::collections::VecDeque;