diff --git a/src/task/cmd.rs b/src/task/cmd.rs
index 0faa781..a0ab576 100644
--- a/src/task/cmd.rs
+++ b/src/task/cmd.rs
@@ -2,6 +2,8 @@ use crate::{Complex, EnvVar, Input, Output};
 use std::process::Command;
 use std::sync::Arc;
 
+use crate::task::Content;
+
 /// [`CommandAction`] is a specific implementation of [`Complex`], used to execute operating system commands.
 pub struct CommandAction {
     command: String,
@@ -33,19 +35,38 @@ impl Complex for CommandAction {
                 args.push(inp)
             }
         });
-        let out = match cmd.args(args).output() {
-            Ok(o) => o,
-            Err(e) => return Output::Err(e.to_string()),
+        let(code,out) = match cmd.args(args).output() {
+            Ok(o) => {
+                (0,o)
+            },
+            Err(e) => {
+                return Output::Err(
+                    e.raw_os_error(),
+                    Some(Content::new(e.to_string()))
+                )
+            }
         };
-
-        if out.status.success() {
-            let mut out = String::from_utf8(out.stdout).unwrap();
+        let stdout: Vec<String> = {
+            let out = String::from_utf8(out.stdout).unwrap_or("".to_string());
             if cfg!(target_os = "windows") {
-                out = out.replace("\r\n", " ").replace('\n', " ");
+                out.rsplit_terminator("\r\n").map(str::to_string).collect()
+            } else {
+                out.split_terminator('\n').map(str::to_string).collect()
             }
-            Output::new(out)
+        };
+        let stderr: Vec<String> = {
+            let out = String::from_utf8(out.stderr).unwrap_or("".to_string());
+            if cfg!(target_os = "windows") {
+                out.rsplit_terminator("\r\n").map(str::to_string).collect()
+            } else {
+                out.split_terminator('\n').map(str::to_string).collect()
+            }
+        };
+        let output = Content::new((stdout,stderr));
+        if out.status.success() {
+            Output::new(output)
         } else {
-            Output::Err(String::from_utf8(out.stderr).unwrap())
+            Output::Err(Some(code),Some(output))
         }
     }
 }
diff --git a/src/task/mod.rs b/src/task/mod.rs
index 3cdb3f9..7d11590 100644
--- a/src/task/mod.rs
+++ b/src/task/mod.rs
@@ -30,7 +30,8 @@ use std::sync::atomic::AtomicUsize;
 pub use self::action::{Action, Complex, Simple};
 pub use self::cmd::CommandAction;
 pub use self::default_task::DefaultTask;
-pub(crate) use self::state::{Content, ExecState};
+pub use self::state::Content;
+pub(crate) use self::state::ExecState;
 pub use self::state::{Input, Output};
 
 mod action;
diff --git a/src/task/state.rs b/src/task/state.rs
index a81acc1..80c1bb0 100644
--- a/src/task/state.rs
+++ b/src/task/state.rs
@@ -22,7 +22,8 @@
 //!
 //! ```rust
 //! use dagrs::Output;
-//! let err_out = Output::Err("some error messages!".to_string());
+//! use dagrs::task::Content;
+//! let err_out = Output::Err(None,Some(Content::new("some error messages!".to_string())));
 //! ```
 //!
 //! # [`Input`]
@@ -95,7 +96,7 @@ pub(crate) struct ExecState {
 #[derive(Debug)]
 pub enum Output {
     Out(Option<Content>),
-    Err(String),
+    Err(Option<i32>,Option<Content>),
 }
 
 /// Task's input value.
@@ -165,14 +166,14 @@ impl Output {
     }
 
     /// Construct an [`Output`]` with an error message.
-    pub fn error(msg: String) -> Self {
-        Self::Err(msg)
+    pub fn error(code: Option<i32>, msg: String) -> Self {
+        Self::Err(code,Some(Content::new(msg)))
     }
 
     /// Determine whether [`Output`] stores error information.
     pub(crate) fn is_err(&self) -> bool {
         match self {
-            Self::Err(_) => true,
+            Self::Err(_,_) => true,
             Self::Out(_) => false,
         }
     }
@@ -181,7 +182,7 @@ impl Output {
     pub(crate) fn get_out(&self) -> Option<Content> {
         match self {
             Self::Out(ref out) => out.clone(),
-            Self::Err(_) => None,
+            Self::Err(_,_) => None,
         }
     }
 
@@ -189,7 +190,13 @@ impl Output {
     pub(crate) fn get_err(&self) -> Option<String> {
         match self {
             Self::Out(_) => None,
-            Self::Err(err) => Some(err.to_string()),
+            Self::Err(_,err) => {
+                if let Some(e) = err {
+                    Some(e.get::<String>()?.to_string())
+                } else {
+                    None
+                }
+            }
         }
     }
 }