Simple Go program to read a file line by line, strip null characters using a regular expression and write the output to an output file

stripNulls.go

package main

import (
	"bufio"
	"flag"
	"fmt"
	"os"
	"regexp"
)

func check(e error) {
	if e != nil {
		fmt.Printf("Failed to open file => %s\n", e)
		panic(e)
	}
}

/*
 *
 *	USAGE :
 *  	go run stripNulls.go --inputFile out.txt --outputFile safe.txt
 *
 */

func main() {

	// command line arguments
	inputFilePtr := flag.String("inputFile", "foo", "input filename")
	outputFilePtr := flag.String("outputFile", "bar", "output filename")
	flag.Parse()
	fmt.Println("inputFile:", *inputFilePtr)

	// compile regex
	reg, err := regexp.Compile("\\x00")
	check(err)

	// open file for reading
	file, err := os.Open(*inputFilePtr)
	check(err)
	defer file.Close()

	// open output  file
	outputF, err := os.Create(*outputFilePtr)
	check(err)
	defer outputF.Close()

	// read file line by line and strip null characters
	scanner := bufio.NewScanner(file)
	for scanner.Scan() {
		myStr := scanner.Text()
		safe := reg.ReplaceAllString(myStr, "")
		safeStr := fmt.Sprint(safe, "\n")
		n3, err := outputF.WriteString(safeStr)
		check(err)
		fmt.Printf("wrote %d bytes\n", n3)
	}
}