Add merging of CommandLine flags to Root command

cobra_test.go

@@ -1147,6 +1147,14 @@ func TestGlobalNormFuncPropagation(t *testing.T) {
 	}
 }
 
+func TestFlagOnPflagCommandLine(t *testing.T) {
+	flagName := "flagOnCommandLine"
+	pflag.CommandLine.String(flagName, "", "about my flag")
+	r := fullSetupTest("--help")
+
+	checkResultContains(t, r, flagName)
+}
+
 func TestAddTemplateFunctions(t *testing.T) {
 	AddTemplateFunc("t", func() bool { return true })
 	AddTemplateFuncs(template.FuncMap{

command.go

@@ -1258,6 +1258,8 @@ func (c *Command) updateParentsPflags() (added []*flag.Flag) {
 		c.parentsPflags.SortFlags = false
 	}
 
+	c.Root().PersistentFlags().AddFlagSet(flag.CommandLine)
+
 	c.VisitParents(func(x *Command) {
 		if x.HasPersistentFlags() {
 			x.PersistentFlags().VisitAll(func(f *flag.Flag) {