I wonder if there is a difference between single and double quoted strings

diff --git a/modules/apt-keys/manifests/init.pp b/modules/apt-keys/manifests/init.pp
index 666b8f6866396dc45b9b66821dffa41a63c86685..6ecdca64823978fd703975cb969a16b2eb07ec5f 100644 (file)
--- a/modules/apt-keys/manifests/init.pp
+++ b/modules/apt-keys/manifests/init.pp
@@ -14,7 +14,7 @@ class apt-keys {
     }
 
     exec { "updatekeys":
-         command => "for keyfile in /etc/apt/trusted-keys.d/*; do apt-key add $keyfile; done",
+         command => 'for keyfile in /etc/apt/trusted-keys.d/*; do apt-key add $keyfile; done',
          refreshonly => true
     }
 }