Implement 'delete' command for interface removal and refactor 'add' command

cmd/delete.go

@@ -0,0 +1,25 @@
+/*
+Copyright © 2026 Masato Kikuchi <m-kikuchi@neody.ad.jp>
+*/
+package cmd
+
+import (
+	"git.neody.ad.jp/tuna2134/etherip-client/utils"
+	"github.com/spf13/cobra"
+)
+
+var DelDevVar string
+
+var deleteCmd = &cobra.Command{
+	Use:   "delete",
+	Short: "Delete iface",
+	Long: `Delete iface`,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		return utils.DelDev(DelDevVar)
+	},
+}
+
+func init() {
+	deleteCmd.Flags().StringVarP(&DelDevVar, "devname", "d", "eip0", "削除対象のNICの名前")
+	rootCmd.AddCommand(deleteCmd)
+}