tool to encode html entities

[T <mlist4suntong@yahoo.com>]

Hi

Any tools can help me encode html entities? E.g.

from 

 sed "s/ /&nbsp;/g" < f1 > f2

to 

 sed &quot;s/ /&amp;nbsp;/g&quot; &lt; f1 &gt; f2

?

thanks

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