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Trim whitespace between quotes - unix shell script

IanPaskin asked
Last Modified: 2013-12-26
i'm working in a shell script that will do some post process tasks to an XML documnet, the XMLwill be outputted with whitespace after some of the values, i need a way of removing the whitespace but only between the double quotes

<ShipNoticeItem lineNumber="50  " quantity="     0">

I've tried a couple of sed commands but i remove the whitespace between the node name and attributes

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