Extract untarred files from a tgz in linux

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http://stackoverflow.com – I have a large .tgz file which is of very large size(19GB). I started the untar operation in vmware last night but in the morning, I saw a blue screen of death. I dont want to waste time on untarring the files that are already done(5GB). How do I untar the files that are not yet untarred into the same folder without wasting time on 5GB. Thanks. (HowTos)