Golang read-write file (i)

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How to use the OS ( overwrite files )

package mainimport (    "fmt"    "os"    "time")func main() {    f, err := os.OpenFile("/tmp/logs/test.log", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0777) //linux 路径    /*f, err := os.OpenFile("D:/tmp/logs/test.log", os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0777)*/ //windows路径    if err != nil {        fmt.Printf("open err%s", err)        return    }    defer f.Close() //资源必须释放,函数刚要返回之前延迟执行    for i := 0; i < 100; i++ {        ret, err2 := f.WriteString("s")        if err2 != nil {            fmt.Printf("write err:\n%s", err2)            return        }        fmt.Println(ret)        time.Sleep(2 * time.Second) //延时2秒    }}

 defer:调用一个被 defer 的函数时在函数刚要返回之前延迟执行，当函数无论怎样返回，某资源必须释放时，可用这种与众不同、但有效的处理方式。传统的例子包括解锁互斥或关闭文件。