Update readme, arg num validation

2 files changed, 26 insertions, 24 deletions

diff --git a/README.md b/README.md
index fb1b649..2e78455 100644
--- a/README.md
+++ b/README.md
@@ -3,32 +3,39 @@ A command line tool to access the system clipboard from anywhere on the command
 
 System clipboard access includes writing (i.e. copy) and reading (i.e. paste), even while logged into a remote machine via ssh.
 
-## Usage
+## Examples
+
 ```
-Reads or writes the system clipboard using the ANSI OSC52 escape sequence.
+❯ echo asdf | osc copy
 
-Usage:
+# String 'asdf' copied to clipboard
 
-COPY mode (default):
+❯ osc paste
+asdf
+```
+
+## Usage
 
-    osc52 [file1 [...fileN]]
+```
+Reads or writes the system clipboard using the ANSI OSC52 escape sequence.
 
-With no arguments, will read from stdin.
+Usage:
+  osc [command]
 
-PASTE mode:
+Available Commands:
+  completion  Generate the autocompletion script for the specified shell
+  copy        Copies input to the system clipboard
+  help        Help about any command
+  paste       Outputs system clipboard contents to stdout
+  version     Outputs version information
 
-    osc52 --paste
+Flags:
+  -h, --help         help for osc
+  -l, --log string   write logs to file
+  -v, --verbose      verbose logging
 
-Outputs clipboard contents to stdout.
+Use "osc [command] --help" for more information about a command.
 
-Options:
-  -logFile string
-    	redirect logs to file
-  -paste
-    	paste operation
-  -v	verbose logging
-  -verbose
-    	verbose logging
 ```
 
 ## Compatibility
@@ -59,17 +66,10 @@ Terminal Multiplexer | Copy | Paste | Notes
 
 ## Installation
 
-#### go 1.16 or later:
-
 ```
 go install -v github.com/theimpostor/osc@latest
 ```
 
-#### go 1.15 or earlier:
-```
-GO111MODULE=on go get github.com/theimpostor/osc@latest
-```
-
 This will install the latest version of osc to `$GOPATH/bin`. To find out where `$GOPATH` is, run `go env GOPATH`
 
 ## TODO
diff --git a/main.go b/main.go
index 18314b7..9cd7fa2 100644
--- a/main.go
+++ b/main.go
@@ -246,6 +246,7 @@ var pasteCmd = &cobra.Command{
 	Long: `Outputs system clipboard contents to stdout. Usage:
 
 osc paste`,
+	Args: cobra.NoArgs,
 	RunE: func(cmd *cobra.Command, args []string) error {
 		logfile := initLogging()
 		defer closeSilently(logfile)
@@ -258,6 +259,7 @@ var versionCmd = &cobra.Command{
 	Use:   "version",
 	Short: "Outputs version information",
 	Long:  `Outputs version information`,
+	Args:  cobra.NoArgs,
 	Run: func(cmd *cobra.Command, args []string) {
 		if info, ok := debug.ReadBuildInfo(); !ok {
 			fmt.Println(`Unable to obtain build info.`)