Improve Cron

src/symbols/cron.rs

@@ -38,15 +38,18 @@ where
     let tab = self
       .command_runner
       .get_output("crontab", &["-l", "-u", &self.user])?;
-    return Ok(tab == self.content.bytes().collect::<Vec<u8>>());
+    Ok(tab == self.content.bytes().collect::<Vec<u8>>())
   }
 
   fn execute(&self) -> Result<(), Box<dyn Error>> {
-    self.command_runner.run_with_args_and_stdin(
+    let output = self.command_runner.run_with_args_and_stdin(
       "crontab",
       &["-u", &self.user, "-"],
       &self.content,
     )?;
+    if !output.status.success() {
+      return Err(String::from_utf8(output.stderr)?.into());
+    }
     Ok(())
   }