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sed - Replace all double quotes with single quotes

I'm trying to replace all double quotes in a string with single quotes. here my expression:

echo "<a href="#" id="resendActivationMailLink">here</a>" | sed "s/"/'/"

unfortunately only the first double quote is replaced :S

<a href='#" id="resendActivationMailLink">here</a> 

any Ideas?

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You need to pass the g flag to sed:

sed "s/"/'/g"

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