预期脚本错误交互:派生id exp4未打开

Question

我有一个脚本，它像我预期的那样工作得很好，但在最后，当它终止时，会产生这个错误：

interact: spawn id exp4 not open
    while executing
"interact"
    (file "./pippo.sh" line 8)

代码是：

#!/usr/bin/expect

# Spawn Python and await prompt
spawn mono OpenSim.exe

expect_background {
    "Now recording all stats to file every {0}ms" { sleep 10 ; send "stats record stop\n" ; expect "Stopped recording stats to file." {sleep 5 ; send "quit\n"} }
}

interact

Answer 1

如果当您的expect_background发送quit\n时，衍生的进程退出，这是正常的。这将关闭将expect连接到进程的文件描述符(派生id)，因此当interact尝试继续读取(或写入)进程时，它将失败。

您可以通过在后台命令中添加一行代码来抑制该错误，该命令会检测文件结束并在文件结束时退出：

expect_background {
  "Now recording all stats to file every {0}ms" \
  { sleep 10 ; send "stats record stop\n" ; \
    expect "Stopped recording stats to file." \
    { sleep 5 ; send "quit\n"; \
      expect eof exit } } }