Go Systems Programming

Printing the permission bits of a file or directory

With the help of the ls(1) command, you can find out the permissions of a file:

$ ls -l /bin/ls
-rwxr-xr-x  1 root  wheel  38624 Mar 23 01:57 /bin/ls

In this subsection, we will look at how to print the permissions of a file or directory using Go: the Go code will be saved in permissions.go and will be presented in two parts. The first part is as follows:

package main 
 
import ( 
   "fmt" 
   "os" 
) 
 
func main() { 
   arguments := os.Args 
   if len(arguments) == 1 { 
         fmt.Println("Please provide an argument!") 
         os.Exit(1) 
   } 
 
   file := arguments[1] 

The second part contains the important Go code:

 info, err := os.Stat(file) if err != nil { fmt.Println("Error:", err) os.Exit(1) } mode := info.Mode() fmt.Print(file, ...