feat(commands): refactor and add more commands

commands/view/cat.go

@@ -0,0 +1,17 @@
+package view
+
+import (
+	"github.com/versenilvis/iris/commands/core"
+)
+
+func init() {
+	core.Register(&core.Spec{
+		Name:        "cat",
+		Description: "concatenate and print",
+		Generator:   core.FileGenerator(),
+		Options: []core.Option{
+			{Name: "-n", Description: "number lines"},
+			{Name: "-b", Description: "number non-blank"},
+		},
+	})
+}