Golang标准库：os/exec包基本示例

以你之姓@ 2024-02-18 09:05 40阅读 0赞

package main
    
    import (
    	"bytes"
    	"fmt"
    	"log"
    	"os"
    	"os/exec"
    )
    
    func main() {
        
    	argNum := len(os.Args)
    	if argNum < 2 {
        
    		log.Printf("Usage:%s command\n", os.Args[0])
    		os.Exit(1)
    	}
    
    	arg := []string{
        }
    	if argNum > 2 {
        
    		arg = os.Args[2:]
    	}
    
    	mainOutput(UsePipe(os.Args[1], arg...))
    }
    
    func mainOutput(out []byte, err error) {
        
    	if err != nil {
        
    		log.Fatal(err)
    	}
    
    	fmt.Printf("The output of command %q is\n%s\n", os.Args[1], out)
    }
    
    // 直接给 Cmd.Stdout 赋值
    func FillStd(name string, arg ...string) ([]byte, error) {
        
    	cmd := exec.Command(name, arg...)
    	var out = new(bytes.Buffer)
    
    	cmd.Stdout = out
    	cmd.Stderr = out
    
    	err := cmd.Run()
    	if err != nil {
        
    		return nil, err
    	}
    
    	return out.Bytes(), nil
    }
    
    func UseOutput(name string, arg ...string) ([]byte, error) {
        
    	return exec.Command(name, arg...).Output()
    }
    
    // 使用 Pipe
    func UsePipe(name string, arg ...string) ([]byte, error) {
        
    	cmd := exec.Command(name, arg...)
    	stdout, err := cmd.StdoutPipe()
    	if err != nil {
        
    		return nil, err
    	}
    
    	if err = cmd.Start(); err != nil {
        
    		return nil, err
    	}
    
    	var out = make([]byte, 0, 1024)
    	for {
        
    		tmp := make([]byte, 128)
    		n, err := stdout.Read(tmp)
    		out = append(out, tmp[:n]...)
    		if err != nil {
        
    			break
    		}
    	}
    
    	if err = cmd.Wait(); err != nil {
        
    		return nil, err
    	}
    
    	return out, nil
    }