diff --git a/acatcher/provision_streamers.sh b/acatcher/provision_streamers.sh
index b5d2620..ad46ce4 100755
--- a/acatcher/provision_streamers.sh
+++ b/acatcher/provision_streamers.sh
@@ -4,10 +4,20 @@ if [ ! -f "$1" ]; then
   exit 1
 fi
 
-./mkhosts.sh "$1"
-./mkacatcher_cpp.sh "$1"
+if [ -z "$2" ]; then
+  ./mkhosts.sh "$1"
+  ./mkacatcher_cpp.sh "$1"
+fi
 
-for HOST in `cat "$1"`; do
+if [ ! -z "$2" ]; then
+  if grep -q "$2" "$1" ]; then
+    HOSTS="$2"
+  fi
+else
+  HOSTS="`cat $1`"
+fi
+echo $HOSTS
+for HOST in $HOSTS; do
   >&2 echo "provisioning host $HOST"
   ssh pi@$HOST "if [ ! -d \$HOME/.ssh ]; then mkdir \$HOME/.ssh; fi; echo `cat $HOME/.ssh/id_rsa.pub` >> \$HOME/.ssh/authorized_keys; chmod 700 \$HOME/.ssh; chmod 644 \$HOME/.ssh/authorized_keys"
   for FILE in HOSTS SERVERIP stream.sh set_hostname.sh v4lcap.c; do scp $FILE pi@$HOST:$FILE; done