当添加一个文件运行shell命令 [英] Run a shell command when a file is added

问题描述

我有我的Linux操作系统中的文件夹命名的图像。
此文件夹连接到一个网站，该网站的管理员有权图片添加到这个网站的能力。然而，在添加图片，我想一个命令来运行调整所有的图片。一个目录

I have a folder named images on my linux box. This folder is connected to a website and the admin of the site has the ability to add pictures to this site. However, when a picture is added, I want a command to run resizing all of the pictures a directory.

总之，我想知道我怎样才能使服务器运行特定的命令时，一个新的文件添加到特定的位置。

In short, I want to know how I can make the server run a specific command when a new file is added to a specific location.

推荐答案

我不知道人们是如何将内容上传到该文件夹​​，但你可能想使用一些低技术含量比监测与inotify的目录。

I don't know how people are uploading content to this folder, but you might want to use something lower-tech than monitoring the directory with inotify.

如果该协议FTP，你可以访问你的FTP服务器的日志，我建议拖尾的日志看成功上传。这种类型的事件触发方式会更快，更可靠，比传统的cron轮询方法负载更小，更便携，更简单。使用inotify的不是一些调试。

If the protocol is FTP and you have access to your FTP server's log, I suggest tailing that log to watch for successful uploads. This sort of event-triggered approach will be faster, more reliable, and less load than a polling approach with traditional cron, and more portable and easier to debug than something using inotify.

您处理，当然这将取决于这样您的FTP服务器上。我有一个运行 vsftpd的其日志包括这样几行：

The way you handle this will of course depend on your FTP server. I have one running vsftpd whose logs include lines like this:

Fri May 25 07:36:02 2012 [pid 94378] [joe] OK LOGIN: Client "10.8.7.16"
Fri May 25 07:36:12 2012 [pid 94380] [joe] OK UPLOAD: Client "10.8.7.16", "/path/to/file.zip", 8395136 bytes, 845.75Kbyte/sec
Fri May 25 07:36:12 2012 [pid 94380] [joe] OK CHMOD: Client "10.8.7.16", "/path/to/file.zip 644"

的上传行仅当vsftpd的成功保存的文件被添加。你可以在这样的shell脚本解析这样的：

The UPLOAD line only gets added when vsftpd has successfully saved the file. You could parse this in a shell script like this:

#!/bin/sh

tail -F /var/log/vsftpd.log | while read line; do
  if echo "$line" | grep -q 'OK UPLOAD:'; then
    filename=$(echo "$line" | cut -d, -f2)
    if [ -s "$filename" ]; then
      # do something with $filename
    fi
  fi
done

如果您使用的是HTTP上传工具，看看是否有工具，使用它来记录输入的文件文本的日志文件。如果不考虑加入一些记录功能给它的，所以它会产生日志，你可以尾。

If you're using an HTTP upload tool, see if that tool has a text log file it uses to record incoming files. If it doesn't consider adding some sort of logger function to it, so it'll produce logs that you can tail.

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