diff --git a/src/command/builtins.rs b/src/command/builtins.rs
index e06b35a..522e63a 100644
--- a/src/command/builtins.rs
+++ b/src/command/builtins.rs
@@ -2,11 +2,12 @@ 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>, exit_code: &mut ExitCode) {
+pub(super) fn cd(args: &Vec<String>, _variables: &mut Variables, exit_code: &mut ExitCode) {
     let path: Option<PathBuf>;
 
     if !args.is_empty() {
@@ -31,11 +32,11 @@ pub(super) fn cd(args: &Vec<String>, exit_code: &mut ExitCode) {
     }
 }
 
-pub(super) fn colon(_args: &Vec<String>, exit_code: &mut ExitCode) {
+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>, exit_code: &mut ExitCode) {
+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() {
@@ -54,3 +55,13 @@ pub(crate) fn exit(args: &Vec<String>, exit_code: &mut ExitCode) {
         error::print(Box::new(raw_exit_code.unwrap_err()));
     }
 }
+
+pub(super) fn unset(args: &Vec<String>, variables: &mut Variables, exit_code: &mut ExitCode) {
+    if !args.is_empty() {
+        for variable_name in args.iter() {
+            variables.unset(variable_name);
+        }
+    }
+
+    exit_code.set_success();
+}
diff --git a/src/command/command_sequence.rs b/src/command/command_sequence.rs
index 083fbd0..8eab94d 100644
--- a/src/command/command_sequence.rs
+++ b/src/command/command_sequence.rs
@@ -1,5 +1,6 @@
 use super::Command;
 use crate::exit_code::ExitCode;
+use crate::variables::Variables;
 
 pub struct CommandSequence {
     command: Option<Box<dyn Command>>,
@@ -34,12 +35,15 @@ impl CommandSequence {
 }
 
 impl Command for CommandSequence {
-    fn spawn(&mut self, exit_code: &mut ExitCode) {
+    fn spawn(&mut self, variables: &mut Variables, exit_code: &mut ExitCode) {
         if self.command.is_some() {
-            self.command.as_mut().unwrap().spawn(exit_code);
+            self.command.as_mut().unwrap().spawn(variables, exit_code);
 
             if self.next_command.is_some() {
-                self.next_command.as_mut().unwrap().spawn(exit_code);
+                self.next_command
+                    .as_mut()
+                    .unwrap()
+                    .spawn(variables, exit_code);
             }
         }
     }
diff --git a/src/command/mod.rs b/src/command/mod.rs
index e78cff0..59b60d0 100644
--- a/src/command/mod.rs
+++ b/src/command/mod.rs
@@ -5,14 +5,15 @@ pub mod command_sequence;
 use crate::error;
 use crate::error::CommandNotFoundError;
 use crate::exit_code::ExitCode;
+use crate::variables::Variables;
 
-type BuiltinFunction = fn(&Vec<String>, &mut ExitCode);
+type BuiltinFunction = fn(&Vec<String>, &mut Variables, &mut ExitCode);
 
 #[derive(Debug)]
 pub struct NoSuchBuiltinError;
 
 pub trait Command {
-    fn spawn(&mut self, exit_code: &mut ExitCode);
+    fn spawn(&mut self, variables: &mut Variables, exit_code: &mut ExitCode);
 }
 
 pub struct Builtin {
@@ -28,6 +29,7 @@ impl Builtin {
         let function: Option<BuiltinFunction> = match program.as_str() {
             "cd" => Some(builtins::cd),
             "exit" => Some(builtins::exit),
+            "unset" => Some(builtins::unset),
             ":" => Some(builtins::colon),
             _ => None,
         };
@@ -44,8 +46,8 @@ impl Builtin {
 }
 
 impl Command for Builtin {
-    fn spawn(&mut self, exit_code: &mut ExitCode) {
-        (self.function)(&self.args, exit_code)
+    fn spawn(&mut self, variables: &mut Variables, exit_code: &mut ExitCode) {
+        (self.function)(&self.args, variables, exit_code)
     }
 }
 
@@ -65,7 +67,7 @@ impl UnixProgram {
 }
 
 impl Command for UnixProgram {
-    fn spawn(&mut self, exit_code: &mut ExitCode) {
+    fn spawn(&mut self, _variables: &mut Variables, exit_code: &mut ExitCode) {
         let handle = self.command.spawn();
 
         if handle.is_ok() {
diff --git a/src/control.rs b/src/control.rs
index 5254d7f..155adbf 100644
--- a/src/control.rs
+++ b/src/control.rs
@@ -16,11 +16,11 @@ pub fn run() {
             let mut command_sequence = parse(user_input.unwrap(), &variables);
 
             if !command_sequence.is_empty() {
-                command_sequence.spawn(&mut current_exit_code);
+                command_sequence.spawn(&mut variables, &mut current_exit_code);
             }
         } else {
             println!();
-            builtins::exit(&vec![], &mut current_exit_code);
+            builtins::exit(&vec![], &mut variables, &mut current_exit_code);
         }
     }
 }