add more examples

Author: kvaps

README.md

@@ -5,16 +5,26 @@ Start a root shell in the node's host OS running.
 
 ## Installation
 
-```
+```bash
 curl -LO https://github.com/kvaps/kubectl-node-shell/raw/master/kubectl-node_shell
 chmod +x ./kubectl-node_shell
 sudo mv ./kubectl-node_shell /usr/local/bin/kubectl-node_shell
 ```
 
 ## Usage
 
-```
+```bash
+# Get standard bash shell
 kubectl node-shell <node>
+
+# Execute custom command
+kubectl node-shell <node> -- echo 123
+
+# Use stdin
+cat /etc/passwd | kubectl node-shell <node> -- sh -c 'cat > /tmp/passwd'
+
+# Run oneliner
+kubectl node-shell <node> -- sh -c 'cat /tmp/passwd; rm -f /tmp/passwd'
 ```
 
 *You need to be able to start privileged containers for that.*