diff --git a/src/main.rs b/src/main.rs
index 568876e..1c9ff4a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -4,6 +4,7 @@ mod error;
 mod exit_code;
 mod interface;
 mod parser;
+mod variables;
 
 fn main() {
     control::run();
diff --git a/src/variables.rs b/src/variables.rs
new file mode 100644
index 0000000..88277b1
--- /dev/null
+++ b/src/variables.rs
@@ -0,0 +1,50 @@
+use std::collections::HashMap;
+use std::env;
+
+struct Variables {
+    variables: HashMap<String, String>,
+}
+
+impl Variables {
+    fn get(&self, key: &str) -> String {
+        let var_from_map = self.variables.get(key);
+
+        let value: String;
+        if var_from_map.is_none() {
+            let var_in_env = env::var(key);
+
+            value = match var_in_env {
+                Ok(value) => value,
+                Err(_e) => String::new(),
+            }
+        } else {
+            value = var_from_map.unwrap().clone();
+        }
+
+        value
+    }
+
+    fn unset(&mut self, key: &str) {
+        let old_value = self.variables.remove(key);
+
+        if old_value.is_none() {
+            env::remove_var(key);
+        }
+    }
+
+    fn set(&mut self, key: &str, value: &str) {
+        self.variables
+            .insert(String::from(key), String::from(value));
+    }
+
+    fn export(&mut self, key: &str) {
+        let var_to_export = self.variables.get(key);
+
+        if var_to_export.is_some() {
+            env::set_var(key, var_to_export.unwrap());
+            self.variables.remove(key);
+        } else {
+            env::set_var(key, "");
+        }
+    }
+}