diff --git a/examples/apt.yaml b/examples/apt.yaml
index 9fc978f..52aae84 100644
--- a/examples/apt.yaml
+++ b/examples/apt.yaml
@@ -1,25 +1,18 @@
 packages:
   - name: Apt
     fetch:
-      exe: sudo
-      params:
-      - apt
-      - update
-      current_dir: null
-      env: {}
-    compile: null
+       - exe: sudo
+         params:
+          - apt
+          - update
     install:
       exe: sudo
       params:
       - apt
       - upgrade
       - --yes
-      current_dir: null
-      env: {}
     post_install:
       - exe: sudo
         params:
         - apt
         - autoremove
-        current_dir: null
-        env: {}
diff --git a/examples/flatpack.yaml b/examples/flatpack.yaml
index be7af86..10aa2f5 100644
--- a/examples/flatpack.yaml
+++ b/examples/flatpack.yaml
@@ -1,14 +1,12 @@
 packages:
   - name: Flatpack
     fetch:
-      exe: flatpak
-      params:
-      - update
-      - --no-deploy
-      - --assumeyes
-      - --noninteractive
-      current_dir: null
-      env: {}
+      - exe: flatpak
+        params:
+        - update
+        - --no-deploy
+        - --assumeyes
+        - --noninteractive
     install:
       exe: flatpak
       params:
@@ -16,8 +14,6 @@ packages:
       - --no-pull
       - --assumeyes
       - --noninteractive
-      current_dir: null
-      env: {}
     post-install:
       - exe: flatpak
         params:
@@ -25,5 +21,3 @@ packages:
         - --unused
         - --assumeyes
         - --noninteractive
-        current_dir: null
-        env: {}
diff --git a/examples/pipx.yaml b/examples/pipx.yaml
index 60c2d52..70faa7c 100644
--- a/examples/pipx.yaml
+++ b/examples/pipx.yaml
@@ -4,5 +4,3 @@ packages:
       exe: pipx
       params:
       - upgrade-all
-      current_dir: null
-      env: {}
diff --git a/examples/rust.yaml b/examples/rust.yaml
index 4a774b2..f1a183a 100644
--- a/examples/rust.yaml
+++ b/examples/rust.yaml
@@ -4,13 +4,9 @@ packages:
       exe: rustup
       params:
       - update
-      current_dir: null
-      env: {}
   - name: Cargo
     install:
       exe: cargo
       params:
       - install-update
       - -a
-      current_dir: null
-      env: {}
diff --git a/src/command.rs b/src/command.rs
index 5f1f03a..4724586 100644
--- a/src/command.rs
+++ b/src/command.rs
@@ -28,8 +28,8 @@ pub struct System {
 #[derive(Debug, Serialize, Deserialize)]
 pub struct Package {
     pub name: String,
-    fetch: Option<Cmd>,
-    compile: Option<Cmd>,
+    fetch: Option<Vec<Cmd>>,
+    compile: Option<Vec<Cmd>>,
     install: Cmd,
     post_install: Option<Vec<Cmd>>,
     // deps or rDeps : Tree
@@ -39,9 +39,9 @@ pub struct Package {
 #[derive(Debug, Clone, Serialize, Deserialize)]
 struct Cmd {
     exe: String,
-    params: Vec<String>,
+    params: Option<Vec<String>>,
     current_dir: Option<PathBuf>,
-    env: HashMap<String, String>,
+    env: Option<HashMap<String, String>>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -131,9 +131,9 @@ impl Updater {
                 compile: None,
                 install: Cmd {
                     exe: "rustup".to_owned(),
-                    params: vec!["self".to_owned(), "update".to_owned()],
+                    params: Some(vec!["self".to_owned(), "update".to_owned()]),
                     current_dir: None,
-                    env: HashMap::new(),
+                    env: None,
                 },
                 post_install: None,
             });
@@ -144,9 +144,9 @@ impl Updater {
                 compile: None,
                 install: Cmd {
                     exe: "cargo".to_owned(),
-                    params: vec!["install-update".to_owned(), "-a".to_owned()],
+                    params: Some(vec!["install-update".to_owned(), "-a".to_owned()]),
                     current_dir: None,
-                    env: HashMap::new(),
+                    env: None,
                 },
                 post_install: None,
             });
@@ -229,17 +229,19 @@ impl Updater {
 impl Package {
     pub fn fetch(&self, opt: &Opt) -> Result<()> {
         if let Some(fetch) = &self.fetch {
-            let cmd = fetch.clone().prepare(opt);
-            let exit_status = cmd
-                .execute(opt)
-                .map_err(|err| MyError::new(MyErrorKind::Fetch, err, cmd.clone()))?;
+            for cmd in fetch {
+                let cmd = cmd.clone().prepare(opt);
+                let exit_status = cmd
+                    .execute(opt)
+                    .map_err(|err| MyError::new(MyErrorKind::Fetch, err, cmd.clone()))?;
 
-            if !exit_status.success() {
-                return Err(MyError::new(
-                    MyErrorKind::Fetch,
-                    io::Error::new(io::ErrorKind::Other, format!("{}", exit_status)),
-                    cmd.clone(),
-                ));
+                if !exit_status.success() {
+                    return Err(MyError::new(
+                        MyErrorKind::Fetch,
+                        io::Error::new(io::ErrorKind::Other, format!("{}", exit_status)),
+                        cmd.clone(),
+                    ));
+                }
             }
         }
         Ok(())
@@ -247,17 +249,19 @@ impl Package {
 
     pub fn compile(&self, opt: &Opt) -> Result<()> {
         if let Some(compile) = &self.compile {
-            let cmd = compile.clone().prepare(opt);
-            let exit_status = cmd
-                .execute(opt)
-                .map_err(|err| MyError::new(MyErrorKind::Compile, err, cmd.clone()))?;
+            for cmd in compile {
+                let cmd = cmd.clone().prepare(opt);
+                let exit_status = cmd
+                    .execute(opt)
+                    .map_err(|err| MyError::new(MyErrorKind::Compile, err, cmd.clone()))?;
 
-            if !exit_status.success() {
-                return Err(MyError::new(
-                    MyErrorKind::Compile,
-                    io::Error::new(io::ErrorKind::Other, format!("{}", exit_status)),
-                    cmd.clone(),
-                ));
+                if !exit_status.success() {
+                    return Err(MyError::new(
+                        MyErrorKind::Compile,
+                        io::Error::new(io::ErrorKind::Other, format!("{}", exit_status)),
+                        cmd.clone(),
+                    ));
+                }
             }
         }
         Ok(())
@@ -304,23 +308,23 @@ impl Cmd {
     fn new() -> Cmd {
         Cmd {
             exe: "".into(),
-            params: vec![],
+            params: None,
             current_dir: None,
-            env: HashMap::new(),
+            env: None,
         }
     }
 
     fn prepare(self, opt: &Opt) -> ActualCmd {
-        let params = self.params;
-
-        let mut env = self.env;
-        if !env.contains_key("PATH") {
-            env.insert("PATH".to_owned(), std::env!("PATH").to_owned());
-        }
+        // TODO: I’m not convinced by helping the user and only escaping the PATH. Either all or none
+        // This means I need to know how to know which values to pass for (at least) rustup & cargo
+        let env = match self.env {
+            Some(env) => env,
+            None => HashMap::from([("PATH".to_owned(), std::env!("PATH").to_owned())]),
+        };
 
         ActualCmd {
             exe: self.exe,
-            params,
+            params: self.params.unwrap_or_default(),
             current_dir: self.current_dir,
             env,
         }