How to create a directory in golang

How to create a directory in golang

The operations on directories and file names in golang are all in the os package. The specific directory creation is It is implemented through the two functions Mkdir and MkdirAll. The usage of these two functions is the same.

os.Mkdir(dirName string, perm FileMode)

1. dirName is the directory (folder path) to be created. , can be an absolute path or a relative path (relative to GOPATH)

2. perm represents the permissions of the created directory, such as 0777 (the read r permission value is 4, the write permission w value is 2, execute The authority Examples are as follows:

package main
 
import (
   "os"
   "fmt"
)
 
func main() {
   err := os.Mkdir("/data/program/goapp/golang", 0666)
   if err != nil {
      fmt.Println(err)
   }
}

The difference between Mkdir and MkdirAll

1. When Mkdir creates a directory, its parent directory must exist, otherwise the creation will fail

2. MkdirAll can create directories recursively, that is, as long as the root directory exists, as follows:

err := os.MkdirAll("/data/program/goapp/golang/test/hello", 0766)
if err != nil {
   fmt.Println(err)
}