show selecting version in docs

README.md

@@ -36,13 +36,33 @@ wget -nv https://bit.ly/node-installer -O - ./node-installer.sh; bash ./node-ins
 ### Choosing a specific version
 
 ```bash
-echo "Current node.js version is $(curl -fsSL https://nodejs.org/dist/index.tab | head -2 | tail -1 | cut -f 1)"
+NODEJS_VER=$(curl -fsSL https://nodejs.org/dist/index.tab | tail -n +2 | cut -f 1 | head -1 )
+echo "The current node.js version is $NODEJS_VER"
 ```
 
 ```bash
-# To install a specific version rather than defaulting to latest
-# latest version at time of writing are v8.11.1 and v10.1.0
-export NODEJS_VER="v10.1.0"
+BASE_VER="v10\\."
+NODEJS_VER=$(curl -fsSL https://nodejs.org/dist/index.tab | tail -n +2 | cut -f 1 | grep $BASE_VER | head -1 )
+echo "Latest node.js $BASE_VER is $NODEJS_VER"
+```
+
+To install the latest of a specific version rather than defaulting to latest
+
+```bash
+### latest version
+export NODEJS_VER=""
+
+# exact version
+export NODEJS_VER="v10.2.1"
+
+# latest of v8.1.x
+export NODEJS_VER="v8.1"
+
+# latest of v8.11.x
+export NODEJS_VER="v8.11"
+
+# latest of v10.x
+export NODEJS_VER="v10"
 ```
 
 ### Choosing an install location
@@ -101,7 +121,7 @@ wget -nv https://bit.ly/node-installer -O /tmp/node-installer.sh; bash /tmp/node
 
 ### Other things you should know
 
-This is what gets installed:
+This is what gets installed with the dev dependencies:
 
 * rsync
 * curl