```ruby
default.admin_essentials.additional_packages = %w()
default.admin_essentials.default_packages = %w(
  mc
  htop
  strace
  screen
  inotify-tools
  debconf-utils
  rlwrap
  multitail
  git-core
  vim
  lsof
  less
  bc
  dc
  psmisc
  tcpdump
  moreutils
  tree
  sudo
  dnsutils
)

default.admin_essentials.all_packages =
  default.admin_essentials.default_packages +
  default.admin_essentials.additional_packages
```

Make sure Emacs and zsh are always installed
user
```ruby
default.admin_essentials.additional_packages = %w()
default.admin_essentials.default_packages = %w(
  mc
  htop
  strace
  screen
  inotify-tools
  debconf-utils
  rlwrap
  multitail
  git-core
  vim
  emacs23-nox
  zsh
  lsof
  less
  bc
  dc
  psmisc
  tcpdump
  moreutils
  tree
  sudo
  dnsutils
)

default.admin_essentials.all_packages =
  default.admin_essentials.default_packages +
  default.admin_essentials.additional_packages
```
assistant