diff --git a/backup.sh b/backup.sh
old mode 100755
new mode 100644
index c37ac90..ffc6758
--- a/backup.sh
+++ b/backup.sh
@@ -1,9 +1,9 @@
 #!/usr/bin/env sh
 
 ### nodes.txt
-# localhost 22 <this host's root zfs> <this host's user>
-# <remote host 1 address> <host 1 port> <host 1 root zfs>
-# <remote host 2 address> <host 2 port> <host 2 root zfs>
+# <local hostname> <local ssh port> <this host's root zfs> <this host's user>
+# <remote host 1 address> <host 1 ssh port> <host 1 root zfs>
+# <remote host 2 address> <host 2 ssh port> <host 2 root zfs>
 # ...
 
 ### datasets.txt (Only required for aggregator setup.)
@@ -15,11 +15,7 @@
 # <dataset 3>
 # ...
 
-if [ ! -f nodes.txt ]; then echo "No nodes specified."; exit 2; fi
-
-read BR_HOST BR_PORT BR_ROOT BR_USER < nodes.txt
-
-list_filesets()
+list_datasets()
 {
     zfs list | tail -n +2 | cut -d' ' -f1|grep ${BR_ROOT}
 }
@@ -44,7 +40,7 @@ setup_aggregator()
 setup_mirror()
 {
     zfs allow -u ${BR_USER} send,snapshot,hold ${BR_ROOT}
-    zfs allow -du ${BR_USER} \
+    zfs allow -u ${BR_USER} \
         compression,mountpoint,receive,create,mount ${BR_ROOT}
 }
 
@@ -57,31 +53,78 @@ create_snapshot()
 send_single_snapshot()
 {
     BR_NEW_SNAPSHOT=`get_latest_snapshot`
+    tail -n +2 nodes.txt > sendnodes.tmp
     while read BR_REMOTE_ADDR BR_REMOTE_PORT BR_REMOTE_ROOT BR_REMOTE_USER; do
-        zfs send -R ${BR_ROOT}@${BR_NEW_SNAPSHOT} |
-            ssh -i ~/.ssh/id_rsa -o port=${BR_REMOTE_PORT} \
-            ${BR_REMOTE_USER}@${BR_REMOTE_ADDR} \
-            zfs receive -dvu ${BR_REMOTE_ROOT}@${BR_NEW_SNAPSHOT}
-    done
-    echo $BR_NEW_SNAPSHOT > "old-snapshot.txt"
+        case $BR_REMOTE_ADDR in
+            \#*) continue;;
+        esac
+        if [ $BR_TEST_MODE = "TRUE" ]; then
+            echo zfs send -R ${BR_ROOT}@${BR_NEW_SNAPSHOT} 
+            echo ssh -i ~/.ssh/id_rsa -o port=${BR_REMOTE_PORT} \
+                ${BR_REMOTE_USER}@${BR_REMOTE_ADDR} \
+                zfs receive -vu ${BR_REMOTE_ROOT}@${BR_NEW_SNAPSHOT}
+        else
+            zfs send -R ${BR_ROOT}@${BR_NEW_SNAPSHOT} |
+                ssh -i ~/.ssh/id_rsa -o port=${BR_REMOTE_PORT} \
+                ${BR_REMOTE_USER}@${BR_REMOTE_ADDR} \
+                zfs receive -dvu ${BR_REMOTE_ROOT}
+        fi
+    done < sendnodes.tmp
+    rm sendnodes.tmp
+    if [ $BR_TEST_MODE = "TRUE" ]; then
+        :
+    else
+        echo $BR_NEW_SNAPSHOT > "old-snapshot.txt"
+    fi
 }
 
 send_incremental_snapshot()
 {
     BR_NEW_SNAPSHOT=`get_latest_snapshot`
-    while read BR_REMOTE_ADDR BR_REMOTE_PORT BR_REMOTE_ROOT BR_REMOTE_USER; do
-        zfs send -R -i `cat old-snapshot.txt` ${BR_ROOT}@${BR_NEW_SNAPSHOT} |
-            ssh -i ~/.ssh/id_rsa -o port=${BR_REMOTE_PORT} \
-            ${BR_REMOTE_USER}@${BR_REMOTE_ADDR} \
-            zfs receive -dvu ${BR_REMOTE_ROOT}@${BR_NEW_SNAPSHOT}
-    done
+    echo Will send $BR_NEW_SNAPSHOT
+    #while read BR_REMOTE_ADDR BR_REMOTE_PORT BR_REMOTE_ROOT BR_REMOTE_USER; do
+    #    zfs send -R -i `cat old-snapshot.txt` ${BR_ROOT}@${BR_NEW_SNAPSHOT} |
+    #        ssh -i ~/.ssh/id_rsa -o port=${BR_REMOTE_PORT} \
+    #        ${BR_REMOTE_USER}@${BR_REMOTE_ADDR} \
+    #        zfs receive -dvu ${BR_REMOTE_ROOT}@${BR_NEW_SNAPSHOT}
+    #done
     echo $BR_NEW_SNAPSHOT > "old-snapshot.txt"
 }
 
-create_snapshot
 
-if [ -f "old-snapshot.txt" ]; then
-    send_incremental_snapshot
-else
-    send_single_snapshot
-fi
\ No newline at end of file
+################################### MAIN ####################################
+
+### Options
+set -- `getopt "tl:" "$@"` || {
+    echo "Usage: `basename $0` [-tl] [command]" 1>&2
+    exit 1
+}
+BR_TEST_MODE=FALSE
+while :; do
+    case "$1" in
+        -t)
+            BR_TEST_MODE=TRUE
+            echo Test mode.
+        ;;
+        --) shift; break ;;
+    esac
+    shift
+done
+
+read BR_HOST BR_PORT BR_ROOT BR_USER < nodes.txt
+
+if [ ! -f nodes.txt ]; then echo "No nodes specified."; exit 2; fi
+
+### Command
+case "$1" in
+    list) list_datasets ;;
+    create) create_snapshot ;;
+    setup-mirror) setup_mirror ;;
+    send)
+        if [ -f "old-snapshot.txt" ]; then
+            send_incremental_snapshot
+        else
+            send_single_snapshot
+        fi            
+    ;;
+esac