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Zero version numbers to clone Cygwin installation

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A Cygwin installation can be cloned by copying `/etc/setup/installed.db` and zeroing all version numbers, then running the installation utility. The following `sed` script will set the version of most packages to zero. Some non-standard version numbers will not be affected and have to be zeroed by hand.

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  1. s/-[0-9]\+\.[0-9]\+\.[0-9]\+\.[0-9a-zA-Z]\+-[0-9]\+\.tar/-0.0.0.0-0.tar/
  2. s/-[0-9]\+\.[0-9]\+\.[0-9a-zA-Z]\+-[0-9]\+\.tar/-0.0.0-0.tar/
  3. s/-[0-9]\+\.[_+0-9a-zA-Z]\+-[0-9]\+\.tar/-0.0-0.tar/
  4. s/-[0-9a-zA-Z]\+-[0-9]\+\.tar/-0-0.tar/
  5. s/-[0-9]\+\.tar/-0.tar/

URL: http://cygwin.com/ml/cygwin/2006-05/msg00753.html

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