Re: [PLUG] sed newbie question

[sean finney <seanius@seanius.net>]

On Thu, Dec 03, 2009 at 06:30:52PM -0500, Michael Lazin wrote:
> Hi, I am interested in writing a shell script that will remove malicious
> iframes from peoples websites.  I am a scripting newbie and a sed newbie.  I
> decided to start by playing around with it.
> 
> sed '/iframe/d' test.html
> 
> cat test.html
> <iframe>frame src=http://evil.com/test</iframe>
> 
> Why didn't this sed line delete the iframe line from my test file?

because sed by default is a stream editor, not a file editor.  if you want
to edit the file in place, throw a "-i" at it (assuming fairly recent
and GNU sed).  

that se^Haid, if you're trying to do anything remotely more
complicated with the html (like catching multiline or nested or posibly
non-standard or mal-formed tags), i think you're on a long downward
spiral of doom trying to send it through a shell script :)


	sean

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