如何将轮询文件保留在目录中，直到它到达 Unix [英] How to keep polling file in a directory till it arrives in Unix

问题描述

我想保留轮询文件，直到它到达该位置 1 小时.

I want to keep polling file till it arrives at the location for 1 hour.

我的目录:/home/stage

文件名(我正在寻找):abc.txt

我想将轮询目录 /home/stage 保持 1 小时，但在 1 小时内，如果 abc.txt 文件到达，则它应该停止轮询并显示消息文件到达否则1小时后应该显示文件没有到达.

I want to keep polling directory /home/stage for 1 hour but within the 1 hour if abc.txt file arrives then it should stop polling and should display the message file arrived otherwise after 1 hour it should display that file has not arrived.

有没有办法在 Unix 中实现这一点?

Is there any way to achieve this in Unix?

推荐答案

另一种 bash 方法，不依赖陷阱处理程序和信号，以防您的更大范围已经将它们用于其他用途:

Another bash method, not relying on trap handlers and signals, in case your larger scope already uses them for other things:

#!/bin/bash
interval=60
((end_time=${SECONDS}+3600))

directory=${HOME}
file=abc.txt

while ((${SECONDS} < ${end_time}))
do
  if [[ -r ${directory}/${file} ]]
  then
    echo "File has arrived."
    exit 0
  fi
  sleep ${interval}
done

echo "File did not arrive."
exit 1

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