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fix: print to set destination, not hardcoded os.Stderr #502

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Merged
tomasaschan merged 1 commit into from
Aug 9, 2026
Merged

fix: print to set destination, not hardcoded os.Stderr #502

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11 changes: 6 additions & 5 deletions flag.go
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Original file line number Diff line number Diff line change
Expand Up @@ -859,12 +859,13 @@ func defaultUsage(f *FlagSet) {
// because it serves (via godoc flag Usage) as the example
// for how to write your own usage function.

// Usage prints to standard error a usage message documenting all defined command-line flags.
// The function is a variable that may be changed to point to a custom function.
// By default it prints a simple header and calls PrintDefaults; for details about the
// format of the output and how to control it, see the documentation for PrintDefaults.
// Usage prints, to the set destination, a usage message documenting all defined
// command-line flags. The function is a variable that may be changed to point to a
// custom function. By default it prints a simple header and calls PrintDefaults; for
// details about the format of the output and how to control it, see the documentation
// for PrintDefaults.
var Usage = func() {
_, _ = fmt.Fprintf(os.Stderr, "Usage of %s:\n", os.Args[0])
_, _ = fmt.Fprintf(CommandLine.Output(), "Usage of %s:\n", os.Args[0])
PrintDefaults()
}

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