sh/sh.go
func Runf(format string, args ...interface{}) ([]byte, error) {
	return Run(fmt.Sprintf(format, args...))
}
func Runf(format string, args ...interface{}) ([]byte, error) {
	return Run(fmt.Sprintf(format, args...))
}
func Runf ( format string , args ... interface { } ) ( [ ] byte , error ) { return Run ( fmt . Sprintf ( format , args ... ) ) }
// Runf is like Run, but formats its arguments according to the format.
// Analogous to Printf().
Runf is like Run but formats its arguments according to the format . Analogous to Printf () .