update README.md with cmd usage and change remote flag to optional

README.md

@@ -107,6 +107,15 @@ $ gossm scp -e '-i key.pem file user@server-domain:/home/blahblah'
 # It is to execute a command("uptime") on selected multiple servers, waiting for a response on its result.
 $ gossm cmd -e "uptime" 
 ```
+
+#### fwd
+`-z` Optionally specify the remote port to access
+`-l` Optionally specify the local port to forward (If not specified when using `-z`, then this value defaults to the value of `-z`)
+
+```bash
+$ gossm fwd -z 8080 -l 42069
+```
+If not specified, you will be prompted to enter a remote and local port after selecting a target. 
 
 **ex)**  
 <p align="center">

cmd/forward.go

@@ -77,12 +77,12 @@ var (
 
 func init() {
 	// add sub command
+	fwdCommand.Flags().StringP("remote", "z", "", "[optional] remote port to forward to, ex) - 8080")
 	fwdCommand.Flags().StringP("local", "l", "", "[optional] local port to use, ex) \"-l 1234\"")
-	fwdCommand.Flags().StringP("remote", "z", "", "[required] remote port to forward to, ex) - 8080")
 
 	// mapping viper
-	viper.BindPFlag("local-port", fwdCommand.Flags().Lookup("local"))
 	viper.BindPFlag("remote-port", fwdCommand.Flags().Lookup("remote"))
+	viper.BindPFlag("local-port", fwdCommand.Flags().Lookup("local"))
 
 	rootCmd.AddCommand(fwdCommand)
 }

go.mod

@@ -9,7 +9,6 @@ require (
 	github.com/gobuffalo/packr/v2 v2.5.2
 	github.com/mitchellh/go-homedir v1.1.0
 	github.com/spf13/cobra v1.0.0
-	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/spf13/viper v1.4.0
 	github.com/stretchr/testify v1.3.0
 )

go.sum

@@ -147,8 +147,6 @@ github.com/spf13/jwalterweatherman v1.0.0 h1:XHEdyB+EcvlqZamSM4ZOMGlc93t6AcsBEu9
 github.com/spf13/jwalterweatherman v1.0.0/go.mod h1:cQK4TGJAtQXfYWX+Ddv3mKDzgVb68N+wFjFa4jdeBTo=
 github.com/spf13/pflag v1.0.3 h1:zPAT6CGy6wXeQ7NtTnaTerfKOsV6V6F8agHXFiazDkg=
 github.com/spf13/pflag v1.0.3/go.mod h1:DYY7MBk1bdzusC3SYhjObp+wFpr4gzcvqqNjLnInEg4=
-github.com/spf13/pflag v1.0.5 h1:iy+VFUOCP1a+8yFto/drg2CJ5u0yRoB7fZw3DKv/JXA=
-github.com/spf13/pflag v1.0.5/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
 github.com/spf13/viper v1.3.2/go.mod h1:ZiWeW+zYFKm7srdB9IoDzzZXaJaI5eL9QjNiN/DMA2s=
 github.com/spf13/viper v1.4.0 h1:yXHLWeravcrgGyFSyCgdYpXQ9dR9c/WED3pg1RhxqEU=
 github.com/spf13/viper v1.4.0/go.mod h1:PTJ7Z/lr49W6bUbkmS1V3by4uWynFiR9p7+dSq/yZzE=