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Quoting or escaping when using exec

From: Moshe Cohen
Subject: Quoting or escaping when using exec
Date: Thu, 3 Mar 2011 21:03:35 +0200

Let's say I want to have an exec action like this:

exec "/bin/bash -c 'mail -s "multi word subject" address@hidden ' "

This will not work because the quotes around the subject collide with the outer quotes.
I have tried several types of escaping these quotes or single quotes, but have't found the way to do it.
How can I escape quotes so the command is passed to the bash script properly?

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