Working with files and I/O / File operations / Essential Go
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package main
import (
"io"
"log"
"os"
)
// CopyFile copies a src file to dst
func CopyFile(dst, src string) error {
srcFile, err := os.Open(src)
if err != nil {
return err
}
defer srcFile.Close()
dstFile, err := os.Create(dst)
if err != nil {
return err
}
_, err = io.Copy(dstFile, srcFile)
err2 := dstFile.Close()
if err == nil && err2 != nil {
err = err2
}
if err != nil {
// delete the destination if copy failed
os.Remove(dst)
}
return err
}
func main() {
src := "main.go"
dst := "main_copy.go"
err := CopyFile(dst, src)
if err != nil {
log.Fatalf("CopyFile failed with '%s'\n", err)
}
os.Remove(dst)
}
Go
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