我需要将图像从S3，处理它的EC2，并保存到S3不同的文件夹。我想在此过程中没有将文件保存到EC2。

I need to get an image from S3, process it on an ec2, and save it to a different folder on S3. I would like to not save the file to ec2 during the process.

是否可以管的结果s3cmd获得S3：//桶/图像为VAR？它似乎并没有打印到标准输出？

Is it possible to pipe the result of "s3cmd get s3://bucket/image" to a var? It does not seem to print to standard output?

推荐答案

这将是更好，如果你能在你的情况显示其输出的农产品 s3cmd 。但是，如果你真的想在命令的输出保存到一个变量，你做这种方式：

It would be better if you could show which output produce s3cmd in your case. But if you really want to save the output of the command to a variable you do it this way:

$ a=$(s3cmd get s3://bucket/image)

当您想要保存标准错误也，你做：

When you want to save stderr also, you make:

$ a=$(s3cmd get s3://bucket/image 2>&1)

只有当标准错误：

$ a=$(s3cmd get s3://bucket/image 2>&1 > /dev/null)