Add 'version' command

main.go

@@ -15,10 +15,13 @@ import (
 	"github.com/urfave/cli"
 )
 
+var version = "0.0.1"
+
 func main() {
 	app := cli.NewApp()
 	app.Name = path.Base(os.Args[0])
 	app.Author = "Manfred Touron"
+	app.Version = version
 	app.Email = "https://github.com/moul/sshportal"
 	app.Flags = []cli.Flag{
 		cli.StringFlag{

shell.go

@@ -323,6 +323,13 @@ GLOBAL OPTIONS:
 					Action: func(c *cli.Context) error { return nil },
 				},
 			},
+		}, {
+			Name:  "version",
+			Usage: "Show the SSHPortal version information",
+			Action: func(c *cli.Context) error {
+				fmt.Fprintf(s, "%s\n", version)
+				return nil
+			},
 		},
 	}