Question

我正在尝试管道2个IO对象，我来自nodejs，我们可以做类似的事情：

const child_process = require('child_process')

const shell = child_process.spawn('/bin/sh')

shell.stdout.pipe(process.stdout)
shell.stdin.write('pwd\n')
shell.stdin.write('ls\n')
/* write all command i want */

我正在寻找与水晶相同的东西

对于当前示例，我知道我们可以编写

shell = Process.new("/bin/sh", input: Process::Redirect::Pipe, output: STDOUT, error: STDOUT)

shell.input << "ls\n"
shell.input << "pwd\n"
# all commands i want

但是由于某种原因将TCPSocket传递给Process.new输入/输出/错误不能很好地工作（如果您有时间Process and TCPSocket not close properly in crystal，请参见此处）

所以我正在寻找另一种看起来像这样的方式：

shell = Process.new("/bin/sh", input: Process::Redirect::Pipe, output: Process::Redirect::Pipe, Process::Redirect::Pipe)

shell.output.pipe(STDOUT) # not the crystal pipe but like the nodejs pipe

shell.input << "ls\n"
shell.input << "pwd\n"
# all commands i want

Answer 1

您可以在协同程序中使用IO.copy：

shell = Process.new("/bin/sh", input: :pipe, output: :pipe, error: :pipe)

spawn { IO.copy shell.output, STDOUT }
spawn { IO.copy shell.error, STDERR }

shell.input << "ls /\n"
shell.input << "pwd\n"

shell.wait

https://carc.in/#/r/75z4

有管道IO的方法吗？

1 个答案: