diff --git a/piping/ls.txt b/piping/ls.txt
new file mode 100644
index 0000000..e69de29
diff --git a/teil17/.gitignore b/teil17/.gitignore
new file mode 100644
index 0000000..de65154
--- /dev/null
+++ b/teil17/.gitignore
@@ -0,0 +1 @@
+backup.txt