Frenetic commented on a Page, Password Generator.  -  Nov 18, 2011 
echo -a $rand(0,9) $+ $rand(0,9) $+ $rand(a,z) $+ $rand(A,Z) $+ $rand(0,9) $+ $rand(0,9) $+ $rand(A,Z) $+ $rand(a,z)

Could be replaced and possibly shortened, with

$+($R(0,9),$r(0,9),$R(0,9),$r(a,z),$R(A,Z),$r(A,z),$R(0,9))

and so on if you get my point

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