Added gvm use version

bin/gvm

@@ -4,12 +4,15 @@ elif [[ $1 == "implode" ]]; then
   rm -rf ~/.gvm
 elif [[ $1 == "install" ]]; then
   ~/.gvm/bin/gvm-install $@
+elif [[ $1 == "use" ]]; then
+  ~/.gvm/bin/gvm-use $@
 else
   echo "== Usage
   gvm Action
 == Action
   version    - print the gvm version number
   implode    - completely remove gvm
-  install    - install go versions"
+  install    - install go versions
+  use        - select a go version to use"
 fi
 

bin/gvm-use

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+if [[ $1 == "use" ]]; then
+  if [[ -n $2 ]]; then
+    cp ~/.gvm/gos/go-$2/bin/* ~/.gvm/bin
+    echo "Now using version $2"
+    exit 0
+  else
+    echo "ERROR: Please specifiy the version"
+    exit 1
+  fi
+else
+  echo "Please use gvm [action] to call this file"
+  exit 1
+fi
+