如何在shell脚本中每2分钟查找一次目录中是否有新文件?

问题描述

我有一个名为/home/user/local 的目录.每两分钟左右，就会有一个新文件转储到该目录中.我需要每2分钟检查一次此目录，以查看是否有新文件放在那里.如果有新文件，我需要将其列表放入变量中，以备后用.我该如何做这个shell脚本?

I have a directory called /home/user/local. Every two minutes or so, a new file is dumped into this directory. I need to check this directory every 2 minutes to see if a new file/files have landed in there. And if there are new files, I need to put a list of it into a variable to use later on. How do I do this shell script?

推荐答案

#! /usr/bin/env bash

FILELIST=/tmp/filelist
MONITOR_DIR=/home/usr/local

[[ -f ${FILELIST} ]] || ls ${MONITOR_DIR} > ${FILELIST}

while : ; do
    cur_files=$(ls ${MONITOR_DIR})
    diff <(cat ${FILELIST}) <(echo $cur_files) || \
         { echo "Alert: ${MONITOR_DIR} changed" ;
           # Overwrite file list with the new one.
           echo $cur_files > ${FILELIST} ;
         }

    echo "Waiting for changes."
    sleep $(expr 60 \* 2)
done

快速&肮脏的方式.:)它将监视目录中的更改，不仅在有新文件转储时，而且在某些文件丢失/删除时也是如此.

a quick & dirty way. :) It'll monitor the directory for changes, not only when there's new file dumped in, but also if some file is missing/deleted.

文件列表存储在变量 $ cur_files 中.

File list is stored in variable $cur_files.

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