Add some tunnels script; not sure what this is

I'll look at it later

bin/tunnels.sh

@@ -0,0 +1,60 @@
+#!/bin/bash
+
+readonly PROGRAM_NAME=$(basename $0)
+readonly PROGRAM_LOC=$(readlink -m $(dirname $0))
+readonly ARGS="$@"
+
+usage() {
+  echo usage: $PROGRAM_NAME LOCAL_PORT REMOTE_PORT REMOTE_HOST
+  exit 1
+}
+
+create_tunnel() {
+  local readonly local_port=$1; shift
+  local readonly remote_port=$1; shift
+  local readonly remote_host=$1; shift
+
+  ssh -f -N $remote_host -R $remote_port":localhost:"$local_port
+}
+
+tunnel_not_present() {
+  local readonly remote_port=$1; shift
+
+  ps ax \
+    | grep ssh \
+    | grep $remote_port \
+    | grep -v grep >> /dev/null
+
+  [[ $? -ne 0 ]]
+}
+
+maintain_tunnel() {
+  local readonly local_port=$1; shift
+  local readonly remote_port=$1; shift
+  local readonly remote_host=$1; shift
+
+  if tunnel_not_present $remote_port;  then
+    create_tunnel $local_port $remote_port $remote_host
+  fi
+}
+
+is_empty() {
+  local readonly string=$1; shift
+
+  [[ -z "$string" ]]
+}
+
+main() {
+  local readonly local_port=$1; shift
+  local readonly remote_port=$1; shift
+  local readonly remote_host=$1; shift
+
+  if is_empty $local_port || is_empty $remote_port || is_empty $remote_host
+  then
+    usage
+  fi
+
+  maintain_tunnel $local_port $remote_port $remote_host
+}
+
+main