Golang flag.NFlag() function example
package flag
NFlag returns the number of command-line flags that have been set.
Golang flag.NFlag() function usage example
...
func main() {
flag.Parse()
if flag.NFlag() == 0 {
fmt.Println("Usage : thisprogramname filename")
os.Exit(1)
}
...
Reference :
See also : Golang flag.NArg() function example
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