golang替换字符串
package main
import (
"bufio"
"fmt"
"io"
"os"
"strings"
)
func main() {
if len(os.Args) != 4 {
fmt.Println("lack of config file, eg: go run main.go ${path_of_file} ${old_string} ${new_string}")
os.Exit(-1)
}
fileName := os.Args[1]
in, err := os.Open(fileName)
if err != nil {
fmt.Println("open file fail:", err)
os.Exit(-1)
}
defer in.Close()
out, err := os.OpenFile(fileName+".mdf", os.O_RDWR|os.O_CREATE, 0766)
if err != nil {
fmt.Println("Open write file fail:", err)
os.Exit(-1)
}
defer out.Close()
br := bufio.NewReader(in)
index := 1
for {
line, _, err := br.ReadLine()
if err == io.EOF {
break
}
if err != nil {
fmt.Println("read err:", err)
os.Exit(-1)
}
newLine := strings.Replace(string(line), os.Args[2], os.Args[3], -1)
_, err = out.WriteString(newLine + "\n")
if err != nil {
fmt.Println("write to file fail:", err)
os.Exit(-1)
}
fmt.Println("done ", index)
index++
}
fmt.Println("FINISH!")
}