prezto/modules/dpkg/functions/deb-clone

#
# Generates a script that can be used to duplicate a dpkg-based system.
#
# Authors:
#   Daniel Bolton <danielbarrettbolton@gmail.com>
#   Sorin Ionescu <sorin.ionescu@gmail.com>
#

local clone_script="${0}.sh"
local package_list=$(
  perl \
    -m 'AptPkg::Cache' \
    -e '
      $c=AptPkg::Cache->new;
      for (keys %$c) {
        push @a, $_ if $c->{$_}->{'CurrentState'} eq 'Installed';
      }
      print "$_ " for sort @a;
    '
)

rm "$clone_script"
print '#!/bin/sh\n' > "$clone_script"
print "aptitude install ${package_list}\n" >> "$clone_script"
chmod +x "$clone_script"