Golang flag.FlagSet.SetOutput() function example
package flag
SetOutput sets the destination for usage and error messages. If output is nil, os.Stderr is used.
Golang flag.FlagSet.SetOutput() function usage example
f := flag.NewFlagSet("", flag.ContinueOnError)
f.SetOutput(ioutil.Discard) // send all usage and error messages to blackhole
Reference :
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