parseSizeInBytes converts strings like 1GB or 12 mb into an unsigned integer number of bytes

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Check if file Exists func exists(fs afero.Fs, path string) (bool, error) { stat, err := fs.Stat(path) if err == nil { return !stat.IsDir(), nil }

mostly copied from pflag's implementation of this operation here https://github.com/spf13/pflag/blob/master/string_to_string.go#L79 alterations are: e