diff --git a/src/Helpers/CommandLine.php b/src/Helpers/CommandLine.php
index f0789fd..c49d535 100644
--- a/src/Helpers/CommandLine.php
+++ b/src/Helpers/CommandLine.php
@@ -2,6 +2,8 @@
 
 namespace AlexTartan\Helpers;
 
+use Webmozart\Assert\Assert;
+
 use function escapeshellarg;
 use function escapeshellcmd;
 
@@ -10,26 +12,41 @@ class CommandLine
     public const STDERR_TO_STDOUT   = ' 2>&1';
     public const STDOUT_TO_DEV_NULL = '/dev/null';
 
+    public const MODE_WRITE  = '>';
+    public const MODE_APPEND = '>>';
+
     private string $command;
     private ?string $workingDirectory;
     private ?string $stdOut = '';
     private ?string $stdErr = '';
-
-    public function __construct(string $command, ?string $workingDirectory, ?string $stdErr, ?string $stdOut)
-    {
+    private bool $background;
+
+    public function __construct(
+        string $command,
+        ?string $workingDirectory,
+        ?string $stdErr,
+        ?string $stdOut,
+        string $stdErrMode = self::MODE_WRITE,
+        string $stdOutMode = self::MODE_WRITE,
+        bool $background = false
+    ) {
         $this->command          = escapeshellcmd($command);
         $this->workingDirectory = $workingDirectory;
+        $this->background       = $background;
+
+        Assert::oneOf($stdErrMode, [self::MODE_WRITE, self::MODE_APPEND]);
+        Assert::oneOf($stdOutMode, [self::MODE_WRITE, self::MODE_APPEND]);
 
         if ($stdErr === self::STDERR_TO_STDOUT) {
             $this->stdErr = self::STDERR_TO_STDOUT;
         } elseif ($stdErr !== null) {
-            $this->stdErr = ' 2> ' . escapeshellarg($stdErr);
+            $this->stdErr = ' 2' . $stdErrMode . ' ' . escapeshellarg($stdErr);
         }
 
         if ($stdOut === self::STDOUT_TO_DEV_NULL) {
-            $this->stdOut = ' > ' . $stdOut;
+            $this->stdOut = ' ' . $stdOutMode . ' ' . $stdOut;
         } elseif ($stdOut !== null) {
-            $this->stdOut = ' > ' . escapeshellarg($stdOut);
+            $this->stdOut = ' ' . $stdOutMode . ' ' . escapeshellarg($stdOut);
         }
     }
 
@@ -66,6 +83,10 @@ public function getFullCommand(): string
             $fullCommand .= $this->stdOut;
         }
 
+        if ($this->background) {
+            $fullCommand .= ' &';
+        }
+
         return $fullCommand;
     }
 
diff --git a/test/Helpers/CommandLineTest.php b/test/Helpers/CommandLineTest.php
index 935d945..56c6c20 100644
--- a/test/Helpers/CommandLineTest.php
+++ b/test/Helpers/CommandLineTest.php
@@ -98,4 +98,58 @@ public function testAdvancedCommandWithWorkingDirAndStdErrAndStdOut(): void
             $commandLine->getFullCommand()
         );
     }
+
+    public function testAdvancedCommandWithWorkingDirAndStdErrAndStdOutAppendAndWrite(): void
+    {
+        $commandLine = (new CommandLine(
+            'ls',
+            '/opt',
+            CommandLine::STDERR_TO_STDOUT,
+            CommandLine::STDOUT_TO_DEV_NULL,
+            CommandLine::MODE_APPEND,
+            CommandLine::MODE_APPEND
+        ))
+            ->withArgument('-la')
+            ->withOption('--color', 'auto', '=');
+
+        self::assertSame(
+            "cd '/opt' && ls '-la' --color='auto' 2>&1 >> /dev/null",
+            $commandLine->getFullCommand()
+        );
+    }
+
+    public function testSimpleCommandWithWorkingDirAndStdErrAndStdOutNonDefaultAppendAndWrite(): void
+    {
+        $commandLine = new CommandLine(
+            'ls',
+            '/opt',
+            '/var/log/err',
+            '/var/log/out',
+            CommandLine::MODE_APPEND,
+            CommandLine::MODE_WRITE
+        );
+
+        self::assertSame(
+            "cd '/opt' && ls 2>> '/var/log/err' > '/var/log/out'",
+            $commandLine->getFullCommand()
+        );
+    }
+
+    public function testSimpleCommandWithWorkingDirAndStdErrAndStdOutNonDefaultAppendAndWriteBackgroundTask(): void
+    {
+        $commandLine = new CommandLine(
+            'ls',
+            '/opt',
+            '/var/log/err',
+            '/var/log/out',
+            CommandLine::MODE_APPEND,
+            CommandLine::MODE_WRITE,
+            true
+        );
+
+        self::assertSame(
+            "cd '/opt' && ls 2>> '/var/log/err' > '/var/log/out' &",
+            $commandLine->getFullCommand()
+        );
+    }
 }