Replicating packages on Debian

[William O'Higgins Witteman]

I've been looking for a way to generate a file which contains all the
packages installed on a Debian system, so that I can then replicate the
system on another machine.  Essentially a list that can be used as input
for an apt-get install.  Has anyone seen anything like this?  Thanks.
-- 

yours,

William

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