There does not appear to be a method to dump the cache of hashed items
system-wide.

What you can do is using an alias/function to install programs, like:
ainst() {
  sudo apt-get install $*
  type rehash > /dev/null && rehash
}

This would automatically call `rehash` after installing any programs.

You might want to test for $UID therein, because "sudo" should not be
used with the root user.

See https://github.com/blueyed/oh-my-
zsh/blob/master/plugins/apt/apt.plugin.zsh for some inspiration.

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https://bugs.launchpad.net/bugs/619409

Title:
  dpkg/apt-get should automatically update zshs cache

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