diff --git a/manifests/defines/delete_lines.pp b/manifests/defines/delete_lines.pp
new file mode 100644
index 0000000..28d2362
--- /dev/null
+++ b/manifests/defines/delete_lines.pp
@@ -0,0 +1,5 @@
+define delete_lines($file, $pattern) {
+   exec { "/bin/sed -i -r -e '/$pattern/d' $file":
+      onlyif => "/bin/grep -E '$pattern' '$file'",
+   }
+}