Read perlop, especially the Quote and Quote like Operators section. You do not need double quotes here, as there is nothing to interpolate, so you can switch to single quotes: 
my $string = 'sysBootFileWrite "QSDvxWorks.aif"';

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For cases where interpolation is needed, you can backslash the inner double quotes or use the qq operator: 

print "He said, \"Hello, $darling.\"";
print qq(He said, "Hello, $darling.");

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لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Double Qoutes in string command by choroba
in thread Double Qoutes in string command by inktuma

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