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Deleting Multiple Files With the Same Content

 
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# 1  
Old 01-06-2010
Question Deleting Multiple Files With the Same Content
My website has been hacked and i need to remove a lot of unique files with same content. The files have very similar code:

Code:
eval(base64_decode

How do i find multiple/all the files with the above code and remove them?

Thanks.
# 2  
Old 01-06-2010
Code:
sed 's/eval(base64_decode//' urfile  (test with it first, then the next commands)
sed -i 's/eval(base64_decode//' urfile  (if your sed support -i option)
perl -i.bak -pe 's/eval\(base64_decode//' urfile

Last edited by rdcwayx; 01-06-2010 at 10:13 PM..
# 3  
Old 01-06-2010
If the intention is to remove all the files having the given pattern, it could be done as follows:
Code:
find . -type f -name \* -exec grep "eval(base64_decode" {} \; -exec rm {} \;

But if you want to just remove the given pattern from the files in which it occurs, use this:
Code:
find . -type f -name \* -exec sed -i 's/eval(base64_decode/ /g' {} \;

Last edited by Scott; 01-07-2010 at 03:25 AM.. Reason: Please use code tags
# 4  
Old 01-07-2010
Quote:
Originally Posted by sank
If the intention is to remove all the files having the given pattern, it could be done as follows:

find . -type f -name \* -exec grep "eval(base64_decode" {} \; -exec rm {} \;
\;
Can somebody explain how does this part works ?
Code:
grep "eval(base64_decode" {} \; -exec rm {} \;

# 5  
Old 01-07-2010
Quite simple, actually, once you know how it works:

find, by default, connects all predicates and actions with a boolean and. This means that for an action to be run, all previous filters ("it's a file") and actions ("grep for eval(base64_decode") have to be true. grep returns a true status if the search string is found, which allows find to run the rm command on that file.
# 6  
Old 01-07-2010
I know that for conditions it is boolean AND. But now came to know that it is for actions also.

The explanation given was simple & excellent, thanks.
# 7  
Old 01-07-2010
Question How to delete specific files with specific content?
Quote:
Originally Posted by sank
If the intention is to remove all the files having the given pattern, it could be done as follows:
Code:
find . -type f -name \* -exec grep "eval(base64_decode" {} \; -exec rm {} \;

But if you want to just remove the given pattern from the files in which it occurs, use this:
Code:
find . -type f -name \* -exec sed -i 's/eval(base64_decode/ /g' {} \;

Sank, you saved me a lot of headache! Thank you. I have another question:

How do i remove specific files with sepecific content?
For example:

I want to remove all files named readme.html which contain words "Please contact us". How to do that?

Thanks!
 
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