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I had a virus or something on my computer that set the attributes for all the folders in the root of my external drive to system and hidden, and created shortcuts to them. I am now trying to remove these attributes all at once with the following command, but it doesn't do anything:

dir /ash /b | attrib -h -s

According to my understanding of the documentation of these commands, this should work. Is there something wrong here?

Thanks

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up vote 1 down vote accepted

Yes. The pipe | redirects program 1's output to program 2's input. However, your program 2 – attribdoes not read any input. It wasn't written to do so. Instead, it expects file names in its command line.

Most Unixes have a tool called xargs to handle such cases of converting text input into command-line arguments. (Most Unixes also have a tool called find to handle this specific case of applying a command recursively, too. (Most Unixes also have a chmod command that has a "recursive mode" option, too, but I guess this is of little relevance here.))

On Windows, without xargs, you will have to do something like:

for/f "tokens=*" %f in ('dir/b/ash') do @attrib -r -h -s "%~f"

Or maybe:

for/r . %f in (*) do @attrib -r -h -s "%~f"
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What a roundabout way of doing things! attrib supports recursion natively, see keltari's answer. – Karan Feb 5 '13 at 2:01
    
Thanks for the explanation as to why it doesn't work. I will try your suggestions. On the other hand, I could also just use my linux machine to do this, although I am not exactly sure how the windows attributes will translate into a linux environment, For instance, this particular thing is not a problem when I just connect the drive to my linux machine (because of the .filename used for hidden folders in unix) – Merwe Feb 5 '13 at 5:39

Actually you can do it in a much easier fashion

attrib e:\*.* -s -h /s

Will remove all the system and hidden attributes starting at the root of the e: drive and all its subdirectories

the /s tells attrib to process subdirectories.

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Can also add /d if the directories have been affected as well. – Karan Feb 5 '13 at 2:01
    
I also considered this option, but only the directories were affected, and only in the root of the drive. I suppose it could not do any harm do do it this way, other than changing the attributes for files that needs to stay hidden and system. I could also use the attrib command on the folders individually, but of course that will take a long time. I was just frustrated that it didn't work although I figured it should. – Merwe Feb 5 '13 at 5:35

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