流执行命令StdoutPipe
I'm trying to stream the Stdout of a shell command to the console, but am having difficulty.
Here's what I currently have:
cmd := exec.Command("sh", "-c", `for number in {0..10}; do echo "$number "; done;`)
pipe, _ := cmd.StdoutPipe()
reader := bufio.NewReader(pipe)
line, err := reader.ReadString('
')
for err == nil {
fmt.Println(line)
line, err = reader.ReadString('
')
}
I would expect this to print out the numbers 0 through 10, but it seems to hang on line 3 (the first call to ReadString.
I started with cmd.Output() and cmd.CombinedOutput(), but those methods seem to buffer the entire output stream until the command is complete. I need to process the output as it streams, not wait until the command is complete.
I also tried this: continuously reading from exec.Cmd output, but it didn't seem to work and I went away from it because I really want to read lines and not have to manage the buffer manually.
Other things I've looked through:
我正在尝试将Shell命令的标准输出流式传输到控制台，但是遇到了困难。 p >
这是我目前拥有的： p>
cmd：= exec.Command（“ sh”，“ -c”，`用于{0中的数字 ..10};回显“ $ number”;完成;`）
pipe，_：= cmd.StdoutPipe（）
reader：= bufio.NewReader（pipe）
line，err：= reader.ReadString（'
'）
for err == nil {
fmt.Println（line）
line，err = reader.ReadString（'
'）
}
code> pre>
我希望它能打印出0到10的数字，但它似乎挂在第3行（第一次调用 ReadString code>。 p>
我开始了 使用 cmd.Output（） code>和 cmd.CombinedOutput（） code>，但是这些方法似乎会缓冲整个输出流，直到命令完成为止。我需要将输出处理为 它会流式传输，而不要等到命令完成。 p>
我还尝试了以下方法：连续读取exec.Cmd输出，但是它似乎不起作用，我放弃了它，因为我真的想读取行，而不必手动管理缓冲区。 / p>
我浏览过的其他内容： p>
You need to start the command:
cmd := exec.Command("sh", "-c", `for number in {0..10}; do echo "$number "; done;`)
pipe, _ := cmd.StdoutPipe()
if err := cmd.Start(); err != nil {
// handle error
}
reader := bufio.NewReader(pipe)
line, err := reader.ReadString('
')
for err == nil {
fmt.Println(line)
line, err = reader.ReadString('
')
}
Call Wait after reaching EOF.
The Output and CombinedOutput methods worked for you because these methods call Start internally.