find -newer 仅检测新复制的文件

发布于 2024-11-18 03:57:33 字数 506 浏览 2 评论 0原文

我正在使用以下代码，

if [ ! -f $time_mark ]
then
    touch $time_mark
fi

cp -f aaa.txt bbb.txt ccc.txt $file_dir
find $file_dir -newer $time_mark > file_list.txt
...

我使用 find -newer 仅发送晚于 $time_mark 复制的文件。但事实证明，如果$time_mark第一次不存在，它将执行touch $time_mark并开始复制文件，这几乎可以同时发生。这会导致 $time_mark 和复制的文件具有相同的系统时间，并且仅发送晚于 $time_mark 复制的文件的整个概念不起作用。

有什么方法可以解决这个问题吗？

谢谢

原文

I am using the following code

if [ ! -f $time_mark ]
then
    touch $time_mark
fi

cp -f aaa.txt bbb.txt ccc.txt $file_dir
find $file_dir -newer $time_mark > file_list.txt
...

I am using find -newer to send only files are that copied later than $time_mark. But it turns out that if $time_mark does not exist for first time, it will execute touch $time_mark and start copying files, which can happen almost at the same time. This results in $time_mark and copied files having the same system time, and the whole concept of sending only files copied later than $time_mark doesn't work.

Is there some way to work around this problem?

Thanks

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戏舞 2024-11-25 03:57:33

if [ -f $time_mark ]
then
    incremental="-newer $time_mark"
else
    incremental=""
    touch $time_mark
fi

...
find $file_dir $incremental > file_list.txt
...

更好的是似乎有条件地执行触摸（仅当先前运行成功时？）

我强烈建议查看 rsync、rdiff-backup 或其他（备份？）理解增量变化检测的工具。

作为一个非常简单的措施，因为您似乎暗示您想要将这些文件（？）复制到某个地方，只需使用 -pu 进行复制（--preserve=mode,ownership,timestamps --update）可以做到这一点

if [ -f $time_mark ]
then
    incremental="-newer $time_mark"
else
    incremental=""
    touch $time_mark
fi

...
find $file_dir $incremental > file_list.txt
...

Even better would seem to execute the touch conditionally (only if the prior run succeeded?)

I strongly suggest to look at rsync, rdiff-backup, or other (backup?) tools that grok incremental change detection.

As a very simple measure, since you seem to hint you want to copy these files (?) somewhere, simply copying with -pu (--preserve=mode,ownership,timestamps --update) could do the trick

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