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go concat
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| package main | |
| import ( | |
| "io/ioutil" | |
| "fmt" | |
| ) | |
| func main(){ | |
| addHeader("a,b,c", "test.csv") | |
| } | |
| func addHeader(header string, filePath string) error { | |
| data, err := ioutil.ReadFile(filePath) | |
| ioutil.WriteFile(filePath, append([]byte(fmt.Sprintln(header)), data...), 0777) | |
| return err | |
| } |
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