如何用Ruby覆盖shell中的打印行? [英] How to overwrite a printed line in the shell with Ruby?

问题描述

如何用 Ruby 在 Unix shell 中覆盖之前打印的行?

How would I overwrite the previously printed line in a Unix shell with Ruby?

假设我想每秒在 shell 上输出当前时间，但不是每个时间字符串都向下堆叠，我想覆盖之前显示的时间.

Say I'd like to output the current time on a shell every second, but instead of stacking down each time string, I'd like to overwrite the previously displayed time.

推荐答案

您可以在行尾使用 \r 转义序列(下一行将覆盖此行).按照你的例子:

You can use the \r escape sequence at the end of the line (the next line will overwrite this line). Following your example:

require 'time'

loop do
  time = Time.now.to_s + "\r"
  print time
  $stdout.flush
  sleep 1
end

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