Go – Pipe 3 or more commands with os.exec()?

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英文:

Go - Pipe 3 or more commands with os.exec()?

问题

你可以使用Go语言中的io.Pipe()函数来实现管道连接多个命令。下面是一个示例代码：

  1. package main
  3. import (
  4. 	"fmt"
  5. 	"io"
  6. 	"os"
  7. 	"os/exec"
  8. )
  10. func main() {
  11. 	cmd1 := exec.Command("ls")
  12. 	cmd2 := exec.Command("grep", "example")
  13. 	cmd3 := exec.Command("wc", "-l")
  15. 	// 创建管道
  16. 	pipeReader, pipeWriter := io.Pipe()
  18. 	// 将cmd1的输出连接到pipeWriter
  19. 	cmd1.Stdout = pipeWriter
  21. 	// 将cmd2的输入连接到pipeReader
  22. 	cmd2.Stdin = pipeReader
  24. 	// 将cmd2的输出连接到os.Stdout
  25. 	cmd2.Stdout = os.Stdout
  27. 	// 将cmd3的输入连接到cmd2的输出
  28. 	cmd3.Stdin = cmd2.Stdout
  30. 	// 启动命令
  31. 	cmd1.Start()
  32. 	cmd2.Start()
  33. 	cmd3.Start()
  35. 	// 等待命令执行完成
  36. 	cmd1.Wait()
  37. 	pipeWriter.Close()
  38. 	cmd2.Wait()
  39. 	cmd3.Wait()
  40. }

这段代码将会执行ls | grep example | wc -l的命令，并将结果输出到标准输出。你可以根据需要修改命令和参数。

英文:

How can I pipe 3+ commands together in Go (for example ls | grep | wc)? I've tried to modify this code that is for piping 2 commands, but can't figure out the correct way.,

  1. package main
  3. import (
  4.     "os"
  5.     "os/exec"
  6. )
  8. func main() {
  9.     c1 := exec.Command("ls")
  10.     c2 := exec.Command("wc", "-l")
  11.     c2.Stdin, _ = c1.StdoutPipe()
  12.     c2.Stdout = os.Stdout
  13.     _ = c2.Start()
  14.     _ = c1.Run()
  15.     _ = c2.Wait()
  16. }

https://stackoverflow.com/a/10953142/3761308

答案1

得分: 4

  1. package main
  3. import (
  4.     "os"
  5.     "os/exec"
  6. )
  8. func main() {
  9.     c1 := exec.Command("ls")
  10.     c2 := exec.Command("grep", "-i", "o")
  11.     c3 := exec.Command("wc", "-l")
  12.     c2.Stdin, _ = c1.StdoutPipe()
  13.     c3.Stdin, _ = c2.StdoutPipe()
  14.     c3.Stdout = os.Stdout
  15.     _ = c3.Start()
  16.     _ = c2.Start()
  17.     _ = c1.Run()
  18.     _ = c2.Wait()
  19.     _ = c3.Wait()
  20. }

这是一个Go语言的代码片段，它使用了os/exec包来执行一系列命令。代码的功能是执行ls命令，然后将输出传递给grep -i o命令，再将输出传递给wc -l命令。最后，将结果输出到标准输出。

英文: 
  1. package main
  3. import (
  4.     "os"
  5.     "os/exec"
  6. )
  8. func main() {
  9.     c1 := exec.Command("ls")
  10.     c2 := exec.Command("grep", "-i", "o")
  11.     c3 := exec.Command("wc", "-l")
  12.     c2.Stdin, _ = c1.StdoutPipe()
  13.     c3.Stdin, _ = c2.StdoutPipe()
  14.     c3.Stdout = os.Stdout
  15.     _ = c3.Start()
  16.     _ = c2.Start()
  17.     _ = c1.Run()
  18.     _ = c2.Wait()
  19.     _ = c3.Wait()
  20. }

huangapple
  • 本文由 发表于 2016年12月28日 20:13:24
  • 转载请务必保留本文链接：https://go.coder-hub.com/41361929.html
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