Add convenience function to do things twice()

dotfiles/bash/main.bashrc

@@ -45,6 +45,14 @@ __bashum_run_n() {
     done
 }
 
+twice() {
+    #
+    # Run $@ two times
+    #
+    "$@"
+    "$@"
+}
+
 git() {
     #
     # /usr/bin/git wrapper just to disable dangerous commands