-This will be readable by the "All users" group, and therefore by every active user. This makes it possible for users to run the bundled Crunch scripts by specifying a commit like "arvados:HEAD", rather than having to pull the Arvados git tree into their own repositories.
+This will be readable by the "All users" group, and therefore by every active user. This makes it possible for users to run the bundled Crunch scripts by specifying @"script_version":"master","repository":"arvados"@ rather than pulling the Arvados source tree into their own repositories.
<pre>
<pre>
-prefix=`arv user current | cut -d- -f1`
+prefix=`arv --format=uuid user current | cut -d- -f1`
+
+echo "Site prefix is '$prefix'"
+# (Make sure it matches your configured 5-character site prefix.)